MDedge Dermatology

As one of the most competitive specialties in medicine, dermatology presents unique challenges for residency applicants, especially following the shift in United States Medical Licensing Examination (USMLE) Step 1 scoring to a pass/fail format.^1,2 Historically, USMLE Step 1 served as a major screening metric for residency programs, with 90% of program directors in 2020 using USMLE Step 1 scores as a primary factor when deciding whether to invite applicants for interviews.¹ However, the recent transition to pass/fail has made it much harder for program directors to objectively compare applicants, particularly in dermatology. In a 2020 survey, Patrinely Jr et al² found that 77.2% of dermatology program directors agreed that this change would make it more difficult to assess candidates objectively. Consequently, research productivity has taken on greater importance as programs seek new ways to distinguish top applicants.^1,2

In response to this increased emphasis on research, dermatology applicants have substantially boosted their scholarly output over the past several years. The 2022 and 2024 results from the National Residency Matching Program’s Charting Outcomes survey demonstrated a steady rise in research metrics among applicants across various specialties, with dermatology showing one of the largest increases.^3,4 For instance, the average number of abstracts, presentations, and publications for matched allopathic dermatology applicants was 5.7 in 2007.⁵ This average increased to 20.9 in 2022³ and to 27.7 in 2024,⁴ marking an astonishing 485% increase in 17 years. Interestingly, unmatched dermatology applicants had an average of 19.0 research products in 2024, which was similar to the average of successfully matched applicants just 2 years earlier.^3,4

Engaging in research offers benefits beyond building a strong residency application. Specifically, it enhances critical thinking skills and provides hands-on experience in scientific inquiry.⁶ It allows students to explore dermatology topics of interest and address existing knowledge gaps within the specialty.⁶ Additionally, it creates opportunities to build meaningful relationships with experienced dermatologists who can guide and support students throughout their careers.⁷ Despite these benefits, the pursuit of research may be landscaped with obstacles, and the fervent race to obtain high research outputs may overshadow developmental advantages.⁸ These challenges and demands also could contribute to inequities in the residency selection process, particularly if barriers are influenced by socioeconomic and demographic disparities. As dermatology already ranks as the second least diverse specialty in medicine,⁹ research requirements that disproportionately disadvantage certain demographic groups risk further widening these concerning representation gaps rather than creating opportunities to address them.

Given these trends in research requirements and their potential impact on applicant success, understanding specific barriers to research engagement is essential for creating equitable opportunities in dermatology. In this study, we aimed to identify barriers to research engagement among dermatology applicants, analyze their relationship with demographic factors, assess their impact on specialty choice and research productivity, and provide actionable solutions to address these obstacles.

Methods

A cross-sectional survey was conducted targeting medical students applying to dermatology residency programs in the United States in the 2025 or 2026 match cycles as well as residents who applied to dermatology residency in the 2021 to 2024 match cycles. The 23-item survey was developed by adapting questions from several validated studies examining research barriers and experiences in medical education.^6,7,10,11 Specifically, the survey included questions on demographics and background; research productivity; general research barriers; conference participation accessibility; mentorship access; and quality, career impact, and support needs. Socioeconomic background was measured via a single self-reported item asking participants to select the income class that best reflected their background growing up (low-income, lower-middle, upper-middle, or high-income); no income ranges were provided.

The survey was distributed electronically via Qualtrics between November 11, 2024, and December 30, 2024, through listserves of the Dermatology Interest Group Association (sent directly to medical students) and the Association of Professors of Dermatology (forwarded to residents by program directors). There was no way to determine the number of dermatology applicants and residents reached through either listserve. The surveys were reviewed and approved by the University of Alabama at Birmingham institutional review board (IRB-300013671).

Statistical analyses were conducted using RStudio (Posit, PBC; version 2024.12.0+467). Descriptive statistics characterized participant demographics and quantified barrier scores using frequencies and proportions. We performed regression analyses to examine relationships between demographic factors and barriers using linear regression; the relationship between barriers and research productivity correlation; and the prediction of specialty change consideration using logistic regression. For all analyses, barrier scores were rated on a scale of 0 to 3 (0=not a barrier, 1=minor barrier, 2=moderate barrier, 3=major barrier); R² values were reported to indicate strength of associations, and statistical significance was set at P<.05.

Results

Participant Demographics—A total of 136 participants completed the survey. Among the respondents, 12% identified as from a background of low-income class, 28% lower-middle class, 49% upper-middle class, and 11% high-income class. Additionally, 27% of respondents identified as underrepresented in medicine (URiM). Regarding debt levels (or expected debt levels) upon graduation from medical school, 32% reported no debt, 9% reported $1000 to $49,000 in debt, 5% reported $50,000 to $99,000 in debt, 15% reported $100,000 to $199,000 in debt, 22% reported $200,000 to $299,000 in debt, and 17% reported $300,000 in debt or higher. The majority of respondents (95%) were MD candidates, and the remaining 5% were DO candidates; additionally, 5% were participants in an MD/PhD program (eTable 1).

Respondents represented various stages of training: 13.2% and 16.2% were third- and fourth-year medical students, respectively, while 6.0%, 20.1%, 18.4%, and 22.8% were postgraduate year (PGY) 1, PGY-2, PGY-3, and PGY-4, respectively. A few respondents (2.9%) were participating in a research year or reapplying to dermatology residency (eTable 2).

Research Barriers and Productivity—Respondents were presented with a list of potential barriers and asked to rate each as not a barrier, a minor barrier, a moderate barrier, or a major barrier. The most common barriers (ie, those with >50% of respondents rating them as a moderate or major) included lack of time, limited access to research opportunities, not knowing how to begin research, and lack of mentorship or support. Lack of time and not knowing where to begin research were reported most frequently as major barriers, with 32% of participants identifying them as such. In contrast, barriers such as financial costs and personal obligations were less frequently rated as major barriers (10% and 4%, respectively), although they still were identified as obstacles by many respondents. Interestingly, most respondents (58%) indicated that institutional limitations were not a barrier, but a separate and sizeable proportion (25%) of respondents considered it to be a major barrier (eFigure 1).

The distributions for all research metrics were right-skewed. The total range was 0 to 45 (median, 6) for number of publications (excluding abstracts), 0 to 33 (median, 2) for published abstracts, 0 to 40 (median, 5) for poster publications, and 0 to 20 (median, 2) for oral presentations (eTable 3).

Regression Analysis—Linear regression analysis identified significant relationships between demographic variables (socioeconomic status [SES], URiM status, and debt level) and individual research barriers. The heatmap in eFigure 2 illustrates the strength of these relationships. Higher SES was predictive of lower reported financial barriers (R²=.2317; P<.0001) and lower reported institutional limitations (R²=.0884; P=.0006). A URiM status predicted higher reported financial barriers (R²=.1097; P<.0001) and institutional limitations (R²=.04537; P=.013). Also, higher debt level predicted increased financial barriers (R²=.2099; P<.0001), institutional limitations (R²=.1258; P<.0001), and lack of mentorship (R²=.06553; P=.003).

Next, the data were evaluated for correlative relationships between individual research barriers and research productivity metrics including number of publications, published abstracts and presentations (oral and poster) and total research output. While correlations were weak or nonsignificant between barriers and most research productivity metrics (published abstracts, oral and poster presentations, and total research output), the number of publications was significantly correlated with several research barriers, including limited access to research opportunities (P=.002), not knowing how to begin research (P=.025), lack of mentorship or support (P=.011), and institutional limitations (P=.042). Higher ratings for limited access to research opportunities, not knowing where to begin research, lack of mentorship or support, and institutional limitations all were negatively correlated with total number of publications (R²=−.27, –.19, −.22, and –.18, respectively)(eFigure 3).

Logistic regression analysis examined the impact of research barriers on the likelihood of specialty change consideration. The results, presented in a forest plot, include odds ratios (ORs) and their corresponding 95% CIs and P values. Lack of time (P=.001) and not knowing where to begin research (P<.001) were the strongest predictors of specialty change consideration (OR, 6.3 and 4.7, ­respectively). Financial cost (P=.043), limited access to research opportunities (P=.006), and lack of mentorship or support (P=.001) also were significant predictors of specialty change consideration (OR, 2.2, 3.1, and 3.5, respectively). Institutional limitations and personal obligations did not predict specialty change consideration (eTable 4 and eFigure 4).

Mitigation Strategies—Mitigation strategies were ranked by respondents based on their perceived importance on a scale of 1 to 7 (1=most important, 7=least important)(eFigure 5). Respondents considered access to engaged mentors to be the most important mitigation strategy by far, with 95% ranking it in the top 3 (47% of respondents ranked it as the top most important mitigation strategy). Financial assistance was the mitigation strategy with the second highest number of respondents (28%) ranking it as the top strategy. Flexible scheduling during rotations, research training programs or discussions, and peer networking and research collaboration opportunities also were considered by respondents to be important mitigation strategies. Time management support/resources frequently was viewed as the least important mitigation strategy, with 38% of respondents ranking it last.

Comment

Our study revealed notable disparities in research barriers among dermatology applicants, with several demonstrating consistent patterns of association with SES, URiM status, and debt burden. Furthermore, the strong relationship between these barriers and decreased research productivity and specialty change consideration suggests that capable candidates may be deterred from pursuing dermatology due to surmountable obstacles rather than lack of interest or ability.

Impact of Demographic Factors on Research Barriers—All 7 general research barriers surveyed were correlated with distinct demographic predictors. Regression analyses indicated that the barrier of financial cost was significantly predicted by lower SES (R²=.2317; P<.001), URiM status (R²=.1097; P<.001), and higher debt levels (R²=.2099; P<.001)(eFigure 2). These findings are particularly concerning given the trend of dermatology applicants pursuing 1-year research fellowships, many of which are unpaid.¹² In fact, Jacobson et al¹¹ found that 71.7% (43/60) of dermatology applicants who pursued a year-long research fellowship experienced financial strain during their fellowship, with many requiring additional loans or drawing from personal savings despite already carrying substantial medical school debt of $200,000 or more. Our findings showcase how financial barriers to research disproportionately affect students from lower socioeconomic backgrounds, those who identify as URiM, and those with higher debt, creating systemic inequities in research access at a time when research productivity is increasingly vital for matching into dermatology. To address these financial barriers, institutions may consider establishing more funded research fellowships or expanding grant programs targeting students from economically disadvantaged and/or underrepresented backgrounds.

Institutional limitations (eg, the absence of a dermatology department) also was a notable barrier that was significantly predicted by lower SES (R²=.0884; P<.001) and URiM status (R²=.04537; P=.013)(eFigure 2). Students at institutions lacking dermatology programs face restricted access to mentorship and research opportunities,¹³ with our results demonstrating that these barriers disproportionately affect students from underresourced and minority groups. These limitations compound disparities in building competitive residency applications.¹⁴ The Women’s Dermatologic Society (WDS) has developed a model for addressing these institutional barriers through its summer research fellowship program for medical students who identify as URiM. By pairing students with WDS mentors who guide them through summer research projects, this initiative addresses access and mentorship gaps for students lacking dermatology departments at their home institution.¹⁵ The WDS program serves as a model for other organizations to adopt and expand, with particular attention to including students who identify as URiM as well as those from lower socioeconomic backgrounds.

Our results identified time constraints and lack of experience as notable research barriers. Higher debt levels significantly predicted both lack of time (R²=.03915; P=.021) and not knowing how to begin research (R²=.0572; P=.005)(eFigure 2). These statistical relationships may be explained by students with higher debt levels needing to prioritize paid work over unpaid research opportunities, limiting their engagement in research due to the scarcity of funded positions.¹² The data further revealed that personal obligations, particularly family care responsibilities, were significantly predicted by both lower SES (R²=.0539; P=.008) and higher debt level (R²=.03237; P=.036)(eFigure 2). These findings demonstrate how students managing academic demands alongside financial and familial responsibilities may face compounded barriers to research engagement. To address these disparities, medical schools may consider implementing protected research time within their curricula; for example, the Emory University School of Medicine (Atlanta, Georgia) has implemented a Discovery Phase program that provides students with 5 months of protected faculty-mentored research time away from academic demands between their third and fourth years of medical school.¹⁶ Integrating similarly structured research periods across medical school curricula could help ensure equitable research opportunities for all students pursuing competitive specialties such as dermatology.⁸

Access to mentorship is a critical determinant of research engagement and productivity, as mentors provide valuable guidance on navigating research processes and professional development.¹⁷ Our analysis revealed that lack of mentorship was predicted by both lower SES (R²=.039; P=.023) and higher debt level (R²=.06553; P=.003)(eFigure 2). Several organizations have developed programs to address these mentorship gaps. The Skin of Color Society pairs medical students with skin of color experts while advancing its mission of increasing diversity in dermatology.¹⁸ Similarly, the American Academy of Dermatology founded a diversity mentorship program that connects students who identify as URiM with dermatologist mentors for summer research experiences.¹⁹ Notably, the Skin of Color Society’s program allows residents to serve as mentors for medical students. Involving residents and community dermatologists as potential dermatology mentors for medical students not only distributes mentorship demands more sustainably but also increases overall access to dermatology mentors. Our findings indicate that similar programs could be expanded to include more residents and community dermatologists as mentors and to target students from disadvantaged backgrounds, those facing financial constraints, and students who identify as URiM. 

Impact of Research Barriers on Career Trajectories—Among survey participants, 35% reported considering changing their specialty choice due to research-related barriers. This substantial percentage likely stems from the escalating pressure to achieve increasingly high research output amidst a lack of sufficient support, time, or tools, as our results suggest. The specific barriers that most notably predicted specialty change consideration were lack of time and not knowing how to begin research (P=.001 and P<.001, respectively). Remarkably, our findings revealed that respondents who rated these as moderate or major barriers were 6.3 and 4.7 times more likely to consider changing their specialty choice, respectively. Respondents reporting financial cost (P=.043), limited access to research opportunities (P=.006), and lack of mentorship or support (P=.001) as at least moderate barriers also were 2.2 to 3.5 times more likely to consider a specialty change (eTable 4 and eFigure 4). Additionally, barriers such as limited access to research opportunities (R²=−.27; P=.002), lack of mentorship (R²=−.22; P=.011), not knowing how to begin research (R²=−.19; P=.025), and institutional limitations (R²=−.18; P=.042) all were associated with lower publication output according to our data (eFigure 3). These findings are especially concerning given current match statistics, where the trajectory of research productivity required for a successful dermatology match continues to rise sharply.^3,4

Alarmingly, many of the barriers we identified—linked to both reduced research output and specialty change consideration—are associated with several demographic factors. Higher debt levels predicted greater likelihood of experiencing lack of time, insufficient mentorship, and uncertainty about initiating research, while lower SES was associated with lack of mentorship. These relationships suggest that structural barriers, rather than lack of interest or ability, may create cumulative disadvantages that deter capable candidates from pursuing dermatology or impact their success in the application process.

One potential solution to address the disproportionate emphasis on research quantity would be implementing caps on reportable research products in residency applications (eg, limiting applications to a certain number of publications, abstracts, and presentations). This change could shift applicant focus toward substantive scientific contributions rather than rapid output accumulation.⁸ The need for such caps was evident in our dataset, which revealed a stark contrast: some respondents reported 30 to 40 publications, while MD/PhD respondents—who dedicate 3 to 5 years to performing quality research—averaged only 7.4 publications. Implementing a research output ceiling could help alleviate barriers for applicants facing institutional and demographic disadvantages while simultaneously boosting the scientific rigor of dermatology research.⁸

Mitigation Strategies From Applicant Feedback—Our findings emphasize the multifaceted relationship between structural barriers and demographics in dermatology research engagement. While our statistical interpretations have outlined several potential interventions, the applicants’ perspectives on mitigation strategies offer qualitative insight. Although participants did not consistently mark financial cost and lack of mentorship as major barriers (eFigure 1), financial assistance and access to engaged mentors were among the highest-ranked mitigation strategies (eFigure 5), suggesting these resources may be fundamental to overcoming multiple structural challenges. To address these needs comprehensively, we propose a multilevel approach: at the institutional level, dermatology interest groups could establish centralized databases of research opportunities, mentorship programs, and funding sources. At the national level, dermatology organizations could consider expanding grant programs, developing virtual mentorship networks, and creating opportunities for external students through remote research projects or short-term research rotations. These interventions, informed by both our statistical analyses and applicant feedback, could help create more equitable access to research opportunities in dermatology.

Limitations

A major limitation of this study was that potential dermatology candidates who were deterred by barriers and later decided on a different specialty would not be captured in our data. As these candidates may have faced substantial barriers that caused them to choose a different path, their absence from the current data may indicate that the reported results underpredict the effect size of the true population. Another limitation is the absence of a control group, such as applicants to less competitive specialties, which would provide valuable context for whether the barriers identified are unique to dermatology.

Conclusion

Our study provides compelling evidence that research barriers in dermatology residency applications intersect with demographic factors to influence research engagement and career trajectories. Our findings suggest that without targeted intervention, increasing emphasis on research productivity may exacerbate existing disparities in dermatology. Moving forward, a coordinated effort among institutions, dermatology associations, and dermatology residency programs will be fundamental to ensure that research requirements enhance rather than impede the development of a diverse, qualified dermatology workforce.

As one of the most competitive specialties in medicine, dermatology presents unique challenges for residency applicants, especially following the shift in United States Medical Licensing Examination (USMLE) Step 1 scoring to a pass/fail format.^1,2 Historically, USMLE Step 1 served as a major screening metric for residency programs, with 90% of program directors in 2020 using USMLE Step 1 scores as a primary factor when deciding whether to invite applicants for interviews.¹ However, the recent transition to pass/fail has made it much harder for program directors to objectively compare applicants, particularly in dermatology. In a 2020 survey, Patrinely Jr et al² found that 77.2% of dermatology program directors agreed that this change would make it more difficult to assess candidates objectively. Consequently, research productivity has taken on greater importance as programs seek new ways to distinguish top applicants.^1,2

In response to this increased emphasis on research, dermatology applicants have substantially boosted their scholarly output over the past several years. The 2022 and 2024 results from the National Residency Matching Program’s Charting Outcomes survey demonstrated a steady rise in research metrics among applicants across various specialties, with dermatology showing one of the largest increases.^3,4 For instance, the average number of abstracts, presentations, and publications for matched allopathic dermatology applicants was 5.7 in 2007.⁵ This average increased to 20.9 in 2022³ and to 27.7 in 2024,⁴ marking an astonishing 485% increase in 17 years. Interestingly, unmatched dermatology applicants had an average of 19.0 research products in 2024, which was similar to the average of successfully matched applicants just 2 years earlier.^3,4

Engaging in research offers benefits beyond building a strong residency application. Specifically, it enhances critical thinking skills and provides hands-on experience in scientific inquiry.⁶ It allows students to explore dermatology topics of interest and address existing knowledge gaps within the specialty.⁶ Additionally, it creates opportunities to build meaningful relationships with experienced dermatologists who can guide and support students throughout their careers.⁷ Despite these benefits, the pursuit of research may be landscaped with obstacles, and the fervent race to obtain high research outputs may overshadow developmental advantages.⁸ These challenges and demands also could contribute to inequities in the residency selection process, particularly if barriers are influenced by socioeconomic and demographic disparities. As dermatology already ranks as the second least diverse specialty in medicine,⁹ research requirements that disproportionately disadvantage certain demographic groups risk further widening these concerning representation gaps rather than creating opportunities to address them.

Given these trends in research requirements and their potential impact on applicant success, understanding specific barriers to research engagement is essential for creating equitable opportunities in dermatology. In this study, we aimed to identify barriers to research engagement among dermatology applicants, analyze their relationship with demographic factors, assess their impact on specialty choice and research productivity, and provide actionable solutions to address these obstacles.

Methods

A cross-sectional survey was conducted targeting medical students applying to dermatology residency programs in the United States in the 2025 or 2026 match cycles as well as residents who applied to dermatology residency in the 2021 to 2024 match cycles. The 23-item survey was developed by adapting questions from several validated studies examining research barriers and experiences in medical education.^6,7,10,11 Specifically, the survey included questions on demographics and background; research productivity; general research barriers; conference participation accessibility; mentorship access; and quality, career impact, and support needs. Socioeconomic background was measured via a single self-reported item asking participants to select the income class that best reflected their background growing up (low-income, lower-middle, upper-middle, or high-income); no income ranges were provided.

The survey was distributed electronically via Qualtrics between November 11, 2024, and December 30, 2024, through listserves of the Dermatology Interest Group Association (sent directly to medical students) and the Association of Professors of Dermatology (forwarded to residents by program directors). There was no way to determine the number of dermatology applicants and residents reached through either listserve. The surveys were reviewed and approved by the University of Alabama at Birmingham institutional review board (IRB-300013671).

Statistical analyses were conducted using RStudio (Posit, PBC; version 2024.12.0+467). Descriptive statistics characterized participant demographics and quantified barrier scores using frequencies and proportions. We performed regression analyses to examine relationships between demographic factors and barriers using linear regression; the relationship between barriers and research productivity correlation; and the prediction of specialty change consideration using logistic regression. For all analyses, barrier scores were rated on a scale of 0 to 3 (0=not a barrier, 1=minor barrier, 2=moderate barrier, 3=major barrier); R² values were reported to indicate strength of associations, and statistical significance was set at P<.05.

Results

Participant Demographics—A total of 136 participants completed the survey. Among the respondents, 12% identified as from a background of low-income class, 28% lower-middle class, 49% upper-middle class, and 11% high-income class. Additionally, 27% of respondents identified as underrepresented in medicine (URiM). Regarding debt levels (or expected debt levels) upon graduation from medical school, 32% reported no debt, 9% reported $1000 to $49,000 in debt, 5% reported $50,000 to $99,000 in debt, 15% reported $100,000 to $199,000 in debt, 22% reported $200,000 to $299,000 in debt, and 17% reported $300,000 in debt or higher. The majority of respondents (95%) were MD candidates, and the remaining 5% were DO candidates; additionally, 5% were participants in an MD/PhD program (eTable 1).

Respondents represented various stages of training: 13.2% and 16.2% were third- and fourth-year medical students, respectively, while 6.0%, 20.1%, 18.4%, and 22.8% were postgraduate year (PGY) 1, PGY-2, PGY-3, and PGY-4, respectively. A few respondents (2.9%) were participating in a research year or reapplying to dermatology residency (eTable 2).

Research Barriers and Productivity—Respondents were presented with a list of potential barriers and asked to rate each as not a barrier, a minor barrier, a moderate barrier, or a major barrier. The most common barriers (ie, those with >50% of respondents rating them as a moderate or major) included lack of time, limited access to research opportunities, not knowing how to begin research, and lack of mentorship or support. Lack of time and not knowing where to begin research were reported most frequently as major barriers, with 32% of participants identifying them as such. In contrast, barriers such as financial costs and personal obligations were less frequently rated as major barriers (10% and 4%, respectively), although they still were identified as obstacles by many respondents. Interestingly, most respondents (58%) indicated that institutional limitations were not a barrier, but a separate and sizeable proportion (25%) of respondents considered it to be a major barrier (eFigure 1).

The distributions for all research metrics were right-skewed. The total range was 0 to 45 (median, 6) for number of publications (excluding abstracts), 0 to 33 (median, 2) for published abstracts, 0 to 40 (median, 5) for poster publications, and 0 to 20 (median, 2) for oral presentations (eTable 3).

Regression Analysis—Linear regression analysis identified significant relationships between demographic variables (socioeconomic status [SES], URiM status, and debt level) and individual research barriers. The heatmap in eFigure 2 illustrates the strength of these relationships. Higher SES was predictive of lower reported financial barriers (R²=.2317; P<.0001) and lower reported institutional limitations (R²=.0884; P=.0006). A URiM status predicted higher reported financial barriers (R²=.1097; P<.0001) and institutional limitations (R²=.04537; P=.013). Also, higher debt level predicted increased financial barriers (R²=.2099; P<.0001), institutional limitations (R²=.1258; P<.0001), and lack of mentorship (R²=.06553; P=.003).

Next, the data were evaluated for correlative relationships between individual research barriers and research productivity metrics including number of publications, published abstracts and presentations (oral and poster) and total research output. While correlations were weak or nonsignificant between barriers and most research productivity metrics (published abstracts, oral and poster presentations, and total research output), the number of publications was significantly correlated with several research barriers, including limited access to research opportunities (P=.002), not knowing how to begin research (P=.025), lack of mentorship or support (P=.011), and institutional limitations (P=.042). Higher ratings for limited access to research opportunities, not knowing where to begin research, lack of mentorship or support, and institutional limitations all were negatively correlated with total number of publications (R²=−.27, –.19, −.22, and –.18, respectively)(eFigure 3).

Logistic regression analysis examined the impact of research barriers on the likelihood of specialty change consideration. The results, presented in a forest plot, include odds ratios (ORs) and their corresponding 95% CIs and P values. Lack of time (P=.001) and not knowing where to begin research (P<.001) were the strongest predictors of specialty change consideration (OR, 6.3 and 4.7, ­respectively). Financial cost (P=.043), limited access to research opportunities (P=.006), and lack of mentorship or support (P=.001) also were significant predictors of specialty change consideration (OR, 2.2, 3.1, and 3.5, respectively). Institutional limitations and personal obligations did not predict specialty change consideration (eTable 4 and eFigure 4).

Mitigation Strategies—Mitigation strategies were ranked by respondents based on their perceived importance on a scale of 1 to 7 (1=most important, 7=least important)(eFigure 5). Respondents considered access to engaged mentors to be the most important mitigation strategy by far, with 95% ranking it in the top 3 (47% of respondents ranked it as the top most important mitigation strategy). Financial assistance was the mitigation strategy with the second highest number of respondents (28%) ranking it as the top strategy. Flexible scheduling during rotations, research training programs or discussions, and peer networking and research collaboration opportunities also were considered by respondents to be important mitigation strategies. Time management support/resources frequently was viewed as the least important mitigation strategy, with 38% of respondents ranking it last.

Comment

Our study revealed notable disparities in research barriers among dermatology applicants, with several demonstrating consistent patterns of association with SES, URiM status, and debt burden. Furthermore, the strong relationship between these barriers and decreased research productivity and specialty change consideration suggests that capable candidates may be deterred from pursuing dermatology due to surmountable obstacles rather than lack of interest or ability.

Impact of Demographic Factors on Research Barriers—All 7 general research barriers surveyed were correlated with distinct demographic predictors. Regression analyses indicated that the barrier of financial cost was significantly predicted by lower SES (R²=.2317; P<.001), URiM status (R²=.1097; P<.001), and higher debt levels (R²=.2099; P<.001)(eFigure 2). These findings are particularly concerning given the trend of dermatology applicants pursuing 1-year research fellowships, many of which are unpaid.¹² In fact, Jacobson et al¹¹ found that 71.7% (43/60) of dermatology applicants who pursued a year-long research fellowship experienced financial strain during their fellowship, with many requiring additional loans or drawing from personal savings despite already carrying substantial medical school debt of $200,000 or more. Our findings showcase how financial barriers to research disproportionately affect students from lower socioeconomic backgrounds, those who identify as URiM, and those with higher debt, creating systemic inequities in research access at a time when research productivity is increasingly vital for matching into dermatology. To address these financial barriers, institutions may consider establishing more funded research fellowships or expanding grant programs targeting students from economically disadvantaged and/or underrepresented backgrounds.

Institutional limitations (eg, the absence of a dermatology department) also was a notable barrier that was significantly predicted by lower SES (R²=.0884; P<.001) and URiM status (R²=.04537; P=.013)(eFigure 2). Students at institutions lacking dermatology programs face restricted access to mentorship and research opportunities,¹³ with our results demonstrating that these barriers disproportionately affect students from underresourced and minority groups. These limitations compound disparities in building competitive residency applications.¹⁴ The Women’s Dermatologic Society (WDS) has developed a model for addressing these institutional barriers through its summer research fellowship program for medical students who identify as URiM. By pairing students with WDS mentors who guide them through summer research projects, this initiative addresses access and mentorship gaps for students lacking dermatology departments at their home institution.¹⁵ The WDS program serves as a model for other organizations to adopt and expand, with particular attention to including students who identify as URiM as well as those from lower socioeconomic backgrounds.

Our results identified time constraints and lack of experience as notable research barriers. Higher debt levels significantly predicted both lack of time (R²=.03915; P=.021) and not knowing how to begin research (R²=.0572; P=.005)(eFigure 2). These statistical relationships may be explained by students with higher debt levels needing to prioritize paid work over unpaid research opportunities, limiting their engagement in research due to the scarcity of funded positions.¹² The data further revealed that personal obligations, particularly family care responsibilities, were significantly predicted by both lower SES (R²=.0539; P=.008) and higher debt level (R²=.03237; P=.036)(eFigure 2). These findings demonstrate how students managing academic demands alongside financial and familial responsibilities may face compounded barriers to research engagement. To address these disparities, medical schools may consider implementing protected research time within their curricula; for example, the Emory University School of Medicine (Atlanta, Georgia) has implemented a Discovery Phase program that provides students with 5 months of protected faculty-mentored research time away from academic demands between their third and fourth years of medical school.¹⁶ Integrating similarly structured research periods across medical school curricula could help ensure equitable research opportunities for all students pursuing competitive specialties such as dermatology.⁸

Access to mentorship is a critical determinant of research engagement and productivity, as mentors provide valuable guidance on navigating research processes and professional development.¹⁷ Our analysis revealed that lack of mentorship was predicted by both lower SES (R²=.039; P=.023) and higher debt level (R²=.06553; P=.003)(eFigure 2). Several organizations have developed programs to address these mentorship gaps. The Skin of Color Society pairs medical students with skin of color experts while advancing its mission of increasing diversity in dermatology.¹⁸ Similarly, the American Academy of Dermatology founded a diversity mentorship program that connects students who identify as URiM with dermatologist mentors for summer research experiences.¹⁹ Notably, the Skin of Color Society’s program allows residents to serve as mentors for medical students. Involving residents and community dermatologists as potential dermatology mentors for medical students not only distributes mentorship demands more sustainably but also increases overall access to dermatology mentors. Our findings indicate that similar programs could be expanded to include more residents and community dermatologists as mentors and to target students from disadvantaged backgrounds, those facing financial constraints, and students who identify as URiM. 

Impact of Research Barriers on Career Trajectories—Among survey participants, 35% reported considering changing their specialty choice due to research-related barriers. This substantial percentage likely stems from the escalating pressure to achieve increasingly high research output amidst a lack of sufficient support, time, or tools, as our results suggest. The specific barriers that most notably predicted specialty change consideration were lack of time and not knowing how to begin research (P=.001 and P<.001, respectively). Remarkably, our findings revealed that respondents who rated these as moderate or major barriers were 6.3 and 4.7 times more likely to consider changing their specialty choice, respectively. Respondents reporting financial cost (P=.043), limited access to research opportunities (P=.006), and lack of mentorship or support (P=.001) as at least moderate barriers also were 2.2 to 3.5 times more likely to consider a specialty change (eTable 4 and eFigure 4). Additionally, barriers such as limited access to research opportunities (R²=−.27; P=.002), lack of mentorship (R²=−.22; P=.011), not knowing how to begin research (R²=−.19; P=.025), and institutional limitations (R²=−.18; P=.042) all were associated with lower publication output according to our data (eFigure 3). These findings are especially concerning given current match statistics, where the trajectory of research productivity required for a successful dermatology match continues to rise sharply.^3,4

Alarmingly, many of the barriers we identified—linked to both reduced research output and specialty change consideration—are associated with several demographic factors. Higher debt levels predicted greater likelihood of experiencing lack of time, insufficient mentorship, and uncertainty about initiating research, while lower SES was associated with lack of mentorship. These relationships suggest that structural barriers, rather than lack of interest or ability, may create cumulative disadvantages that deter capable candidates from pursuing dermatology or impact their success in the application process.

One potential solution to address the disproportionate emphasis on research quantity would be implementing caps on reportable research products in residency applications (eg, limiting applications to a certain number of publications, abstracts, and presentations). This change could shift applicant focus toward substantive scientific contributions rather than rapid output accumulation.⁸ The need for such caps was evident in our dataset, which revealed a stark contrast: some respondents reported 30 to 40 publications, while MD/PhD respondents—who dedicate 3 to 5 years to performing quality research—averaged only 7.4 publications. Implementing a research output ceiling could help alleviate barriers for applicants facing institutional and demographic disadvantages while simultaneously boosting the scientific rigor of dermatology research.⁸

Mitigation Strategies From Applicant Feedback—Our findings emphasize the multifaceted relationship between structural barriers and demographics in dermatology research engagement. While our statistical interpretations have outlined several potential interventions, the applicants’ perspectives on mitigation strategies offer qualitative insight. Although participants did not consistently mark financial cost and lack of mentorship as major barriers (eFigure 1), financial assistance and access to engaged mentors were among the highest-ranked mitigation strategies (eFigure 5), suggesting these resources may be fundamental to overcoming multiple structural challenges. To address these needs comprehensively, we propose a multilevel approach: at the institutional level, dermatology interest groups could establish centralized databases of research opportunities, mentorship programs, and funding sources. At the national level, dermatology organizations could consider expanding grant programs, developing virtual mentorship networks, and creating opportunities for external students through remote research projects or short-term research rotations. These interventions, informed by both our statistical analyses and applicant feedback, could help create more equitable access to research opportunities in dermatology.

Limitations

A major limitation of this study was that potential dermatology candidates who were deterred by barriers and later decided on a different specialty would not be captured in our data. As these candidates may have faced substantial barriers that caused them to choose a different path, their absence from the current data may indicate that the reported results underpredict the effect size of the true population. Another limitation is the absence of a control group, such as applicants to less competitive specialties, which would provide valuable context for whether the barriers identified are unique to dermatology.

Conclusion

Our study provides compelling evidence that research barriers in dermatology residency applications intersect with demographic factors to influence research engagement and career trajectories. Our findings suggest that without targeted intervention, increasing emphasis on research productivity may exacerbate existing disparities in dermatology. Moving forward, a coordinated effort among institutions, dermatology associations, and dermatology residency programs will be fundamental to ensure that research requirements enhance rather than impede the development of a diverse, qualified dermatology workforce.

As one of the most competitive specialties in medicine, dermatology presents unique challenges for residency applicants, especially following the shift in United States Medical Licensing Examination (USMLE) Step 1 scoring to a pass/fail format.^1,2 Historically, USMLE Step 1 served as a major screening metric for residency programs, with 90% of program directors in 2020 using USMLE Step 1 scores as a primary factor when deciding whether to invite applicants for interviews.¹ However, the recent transition to pass/fail has made it much harder for program directors to objectively compare applicants, particularly in dermatology. In a 2020 survey, Patrinely Jr et al² found that 77.2% of dermatology program directors agreed that this change would make it more difficult to assess candidates objectively. Consequently, research productivity has taken on greater importance as programs seek new ways to distinguish top applicants.^1,2

In response to this increased emphasis on research, dermatology applicants have substantially boosted their scholarly output over the past several years. The 2022 and 2024 results from the National Residency Matching Program’s Charting Outcomes survey demonstrated a steady rise in research metrics among applicants across various specialties, with dermatology showing one of the largest increases.^3,4 For instance, the average number of abstracts, presentations, and publications for matched allopathic dermatology applicants was 5.7 in 2007.⁵ This average increased to 20.9 in 2022³ and to 27.7 in 2024,⁴ marking an astonishing 485% increase in 17 years. Interestingly, unmatched dermatology applicants had an average of 19.0 research products in 2024, which was similar to the average of successfully matched applicants just 2 years earlier.^3,4

Engaging in research offers benefits beyond building a strong residency application. Specifically, it enhances critical thinking skills and provides hands-on experience in scientific inquiry.⁶ It allows students to explore dermatology topics of interest and address existing knowledge gaps within the specialty.⁶ Additionally, it creates opportunities to build meaningful relationships with experienced dermatologists who can guide and support students throughout their careers.⁷ Despite these benefits, the pursuit of research may be landscaped with obstacles, and the fervent race to obtain high research outputs may overshadow developmental advantages.⁸ These challenges and demands also could contribute to inequities in the residency selection process, particularly if barriers are influenced by socioeconomic and demographic disparities. As dermatology already ranks as the second least diverse specialty in medicine,⁹ research requirements that disproportionately disadvantage certain demographic groups risk further widening these concerning representation gaps rather than creating opportunities to address them.

Given these trends in research requirements and their potential impact on applicant success, understanding specific barriers to research engagement is essential for creating equitable opportunities in dermatology. In this study, we aimed to identify barriers to research engagement among dermatology applicants, analyze their relationship with demographic factors, assess their impact on specialty choice and research productivity, and provide actionable solutions to address these obstacles.

Methods

A cross-sectional survey was conducted targeting medical students applying to dermatology residency programs in the United States in the 2025 or 2026 match cycles as well as residents who applied to dermatology residency in the 2021 to 2024 match cycles. The 23-item survey was developed by adapting questions from several validated studies examining research barriers and experiences in medical education.^6,7,10,11 Specifically, the survey included questions on demographics and background; research productivity; general research barriers; conference participation accessibility; mentorship access; and quality, career impact, and support needs. Socioeconomic background was measured via a single self-reported item asking participants to select the income class that best reflected their background growing up (low-income, lower-middle, upper-middle, or high-income); no income ranges were provided.

The survey was distributed electronically via Qualtrics between November 11, 2024, and December 30, 2024, through listserves of the Dermatology Interest Group Association (sent directly to medical students) and the Association of Professors of Dermatology (forwarded to residents by program directors). There was no way to determine the number of dermatology applicants and residents reached through either listserve. The surveys were reviewed and approved by the University of Alabama at Birmingham institutional review board (IRB-300013671).

Statistical analyses were conducted using RStudio (Posit, PBC; version 2024.12.0+467). Descriptive statistics characterized participant demographics and quantified barrier scores using frequencies and proportions. We performed regression analyses to examine relationships between demographic factors and barriers using linear regression; the relationship between barriers and research productivity correlation; and the prediction of specialty change consideration using logistic regression. For all analyses, barrier scores were rated on a scale of 0 to 3 (0=not a barrier, 1=minor barrier, 2=moderate barrier, 3=major barrier); R² values were reported to indicate strength of associations, and statistical significance was set at P<.05.

Results

Participant Demographics—A total of 136 participants completed the survey. Among the respondents, 12% identified as from a background of low-income class, 28% lower-middle class, 49% upper-middle class, and 11% high-income class. Additionally, 27% of respondents identified as underrepresented in medicine (URiM). Regarding debt levels (or expected debt levels) upon graduation from medical school, 32% reported no debt, 9% reported $1000 to $49,000 in debt, 5% reported $50,000 to $99,000 in debt, 15% reported $100,000 to $199,000 in debt, 22% reported $200,000 to $299,000 in debt, and 17% reported $300,000 in debt or higher. The majority of respondents (95%) were MD candidates, and the remaining 5% were DO candidates; additionally, 5% were participants in an MD/PhD program (eTable 1).

Respondents represented various stages of training: 13.2% and 16.2% were third- and fourth-year medical students, respectively, while 6.0%, 20.1%, 18.4%, and 22.8% were postgraduate year (PGY) 1, PGY-2, PGY-3, and PGY-4, respectively. A few respondents (2.9%) were participating in a research year or reapplying to dermatology residency (eTable 2).

Research Barriers and Productivity—Respondents were presented with a list of potential barriers and asked to rate each as not a barrier, a minor barrier, a moderate barrier, or a major barrier. The most common barriers (ie, those with >50% of respondents rating them as a moderate or major) included lack of time, limited access to research opportunities, not knowing how to begin research, and lack of mentorship or support. Lack of time and not knowing where to begin research were reported most frequently as major barriers, with 32% of participants identifying them as such. In contrast, barriers such as financial costs and personal obligations were less frequently rated as major barriers (10% and 4%, respectively), although they still were identified as obstacles by many respondents. Interestingly, most respondents (58%) indicated that institutional limitations were not a barrier, but a separate and sizeable proportion (25%) of respondents considered it to be a major barrier (eFigure 1).

The distributions for all research metrics were right-skewed. The total range was 0 to 45 (median, 6) for number of publications (excluding abstracts), 0 to 33 (median, 2) for published abstracts, 0 to 40 (median, 5) for poster publications, and 0 to 20 (median, 2) for oral presentations (eTable 3).

Regression Analysis—Linear regression analysis identified significant relationships between demographic variables (socioeconomic status [SES], URiM status, and debt level) and individual research barriers. The heatmap in eFigure 2 illustrates the strength of these relationships. Higher SES was predictive of lower reported financial barriers (R²=.2317; P<.0001) and lower reported institutional limitations (R²=.0884; P=.0006). A URiM status predicted higher reported financial barriers (R²=.1097; P<.0001) and institutional limitations (R²=.04537; P=.013). Also, higher debt level predicted increased financial barriers (R²=.2099; P<.0001), institutional limitations (R²=.1258; P<.0001), and lack of mentorship (R²=.06553; P=.003).

Next, the data were evaluated for correlative relationships between individual research barriers and research productivity metrics including number of publications, published abstracts and presentations (oral and poster) and total research output. While correlations were weak or nonsignificant between barriers and most research productivity metrics (published abstracts, oral and poster presentations, and total research output), the number of publications was significantly correlated with several research barriers, including limited access to research opportunities (P=.002), not knowing how to begin research (P=.025), lack of mentorship or support (P=.011), and institutional limitations (P=.042). Higher ratings for limited access to research opportunities, not knowing where to begin research, lack of mentorship or support, and institutional limitations all were negatively correlated with total number of publications (R²=−.27, –.19, −.22, and –.18, respectively)(eFigure 3).

Logistic regression analysis examined the impact of research barriers on the likelihood of specialty change consideration. The results, presented in a forest plot, include odds ratios (ORs) and their corresponding 95% CIs and P values. Lack of time (P=.001) and not knowing where to begin research (P<.001) were the strongest predictors of specialty change consideration (OR, 6.3 and 4.7, ­respectively). Financial cost (P=.043), limited access to research opportunities (P=.006), and lack of mentorship or support (P=.001) also were significant predictors of specialty change consideration (OR, 2.2, 3.1, and 3.5, respectively). Institutional limitations and personal obligations did not predict specialty change consideration (eTable 4 and eFigure 4).

Mitigation Strategies—Mitigation strategies were ranked by respondents based on their perceived importance on a scale of 1 to 7 (1=most important, 7=least important)(eFigure 5). Respondents considered access to engaged mentors to be the most important mitigation strategy by far, with 95% ranking it in the top 3 (47% of respondents ranked it as the top most important mitigation strategy). Financial assistance was the mitigation strategy with the second highest number of respondents (28%) ranking it as the top strategy. Flexible scheduling during rotations, research training programs or discussions, and peer networking and research collaboration opportunities also were considered by respondents to be important mitigation strategies. Time management support/resources frequently was viewed as the least important mitigation strategy, with 38% of respondents ranking it last.

Comment

Our study revealed notable disparities in research barriers among dermatology applicants, with several demonstrating consistent patterns of association with SES, URiM status, and debt burden. Furthermore, the strong relationship between these barriers and decreased research productivity and specialty change consideration suggests that capable candidates may be deterred from pursuing dermatology due to surmountable obstacles rather than lack of interest or ability.

Impact of Demographic Factors on Research Barriers—All 7 general research barriers surveyed were correlated with distinct demographic predictors. Regression analyses indicated that the barrier of financial cost was significantly predicted by lower SES (R²=.2317; P<.001), URiM status (R²=.1097; P<.001), and higher debt levels (R²=.2099; P<.001)(eFigure 2). These findings are particularly concerning given the trend of dermatology applicants pursuing 1-year research fellowships, many of which are unpaid.¹² In fact, Jacobson et al¹¹ found that 71.7% (43/60) of dermatology applicants who pursued a year-long research fellowship experienced financial strain during their fellowship, with many requiring additional loans or drawing from personal savings despite already carrying substantial medical school debt of $200,000 or more. Our findings showcase how financial barriers to research disproportionately affect students from lower socioeconomic backgrounds, those who identify as URiM, and those with higher debt, creating systemic inequities in research access at a time when research productivity is increasingly vital for matching into dermatology. To address these financial barriers, institutions may consider establishing more funded research fellowships or expanding grant programs targeting students from economically disadvantaged and/or underrepresented backgrounds.

Institutional limitations (eg, the absence of a dermatology department) also was a notable barrier that was significantly predicted by lower SES (R²=.0884; P<.001) and URiM status (R²=.04537; P=.013)(eFigure 2). Students at institutions lacking dermatology programs face restricted access to mentorship and research opportunities,¹³ with our results demonstrating that these barriers disproportionately affect students from underresourced and minority groups. These limitations compound disparities in building competitive residency applications.¹⁴ The Women’s Dermatologic Society (WDS) has developed a model for addressing these institutional barriers through its summer research fellowship program for medical students who identify as URiM. By pairing students with WDS mentors who guide them through summer research projects, this initiative addresses access and mentorship gaps for students lacking dermatology departments at their home institution.¹⁵ The WDS program serves as a model for other organizations to adopt and expand, with particular attention to including students who identify as URiM as well as those from lower socioeconomic backgrounds.

Our results identified time constraints and lack of experience as notable research barriers. Higher debt levels significantly predicted both lack of time (R²=.03915; P=.021) and not knowing how to begin research (R²=.0572; P=.005)(eFigure 2). These statistical relationships may be explained by students with higher debt levels needing to prioritize paid work over unpaid research opportunities, limiting their engagement in research due to the scarcity of funded positions.¹² The data further revealed that personal obligations, particularly family care responsibilities, were significantly predicted by both lower SES (R²=.0539; P=.008) and higher debt level (R²=.03237; P=.036)(eFigure 2). These findings demonstrate how students managing academic demands alongside financial and familial responsibilities may face compounded barriers to research engagement. To address these disparities, medical schools may consider implementing protected research time within their curricula; for example, the Emory University School of Medicine (Atlanta, Georgia) has implemented a Discovery Phase program that provides students with 5 months of protected faculty-mentored research time away from academic demands between their third and fourth years of medical school.¹⁶ Integrating similarly structured research periods across medical school curricula could help ensure equitable research opportunities for all students pursuing competitive specialties such as dermatology.⁸

Access to mentorship is a critical determinant of research engagement and productivity, as mentors provide valuable guidance on navigating research processes and professional development.¹⁷ Our analysis revealed that lack of mentorship was predicted by both lower SES (R²=.039; P=.023) and higher debt level (R²=.06553; P=.003)(eFigure 2). Several organizations have developed programs to address these mentorship gaps. The Skin of Color Society pairs medical students with skin of color experts while advancing its mission of increasing diversity in dermatology.¹⁸ Similarly, the American Academy of Dermatology founded a diversity mentorship program that connects students who identify as URiM with dermatologist mentors for summer research experiences.¹⁹ Notably, the Skin of Color Society’s program allows residents to serve as mentors for medical students. Involving residents and community dermatologists as potential dermatology mentors for medical students not only distributes mentorship demands more sustainably but also increases overall access to dermatology mentors. Our findings indicate that similar programs could be expanded to include more residents and community dermatologists as mentors and to target students from disadvantaged backgrounds, those facing financial constraints, and students who identify as URiM. 

Impact of Research Barriers on Career Trajectories—Among survey participants, 35% reported considering changing their specialty choice due to research-related barriers. This substantial percentage likely stems from the escalating pressure to achieve increasingly high research output amidst a lack of sufficient support, time, or tools, as our results suggest. The specific barriers that most notably predicted specialty change consideration were lack of time and not knowing how to begin research (P=.001 and P<.001, respectively). Remarkably, our findings revealed that respondents who rated these as moderate or major barriers were 6.3 and 4.7 times more likely to consider changing their specialty choice, respectively. Respondents reporting financial cost (P=.043), limited access to research opportunities (P=.006), and lack of mentorship or support (P=.001) as at least moderate barriers also were 2.2 to 3.5 times more likely to consider a specialty change (eTable 4 and eFigure 4). Additionally, barriers such as limited access to research opportunities (R²=−.27; P=.002), lack of mentorship (R²=−.22; P=.011), not knowing how to begin research (R²=−.19; P=.025), and institutional limitations (R²=−.18; P=.042) all were associated with lower publication output according to our data (eFigure 3). These findings are especially concerning given current match statistics, where the trajectory of research productivity required for a successful dermatology match continues to rise sharply.^3,4

Alarmingly, many of the barriers we identified—linked to both reduced research output and specialty change consideration—are associated with several demographic factors. Higher debt levels predicted greater likelihood of experiencing lack of time, insufficient mentorship, and uncertainty about initiating research, while lower SES was associated with lack of mentorship. These relationships suggest that structural barriers, rather than lack of interest or ability, may create cumulative disadvantages that deter capable candidates from pursuing dermatology or impact their success in the application process.

One potential solution to address the disproportionate emphasis on research quantity would be implementing caps on reportable research products in residency applications (eg, limiting applications to a certain number of publications, abstracts, and presentations). This change could shift applicant focus toward substantive scientific contributions rather than rapid output accumulation.⁸ The need for such caps was evident in our dataset, which revealed a stark contrast: some respondents reported 30 to 40 publications, while MD/PhD respondents—who dedicate 3 to 5 years to performing quality research—averaged only 7.4 publications. Implementing a research output ceiling could help alleviate barriers for applicants facing institutional and demographic disadvantages while simultaneously boosting the scientific rigor of dermatology research.⁸

Mitigation Strategies From Applicant Feedback—Our findings emphasize the multifaceted relationship between structural barriers and demographics in dermatology research engagement. While our statistical interpretations have outlined several potential interventions, the applicants’ perspectives on mitigation strategies offer qualitative insight. Although participants did not consistently mark financial cost and lack of mentorship as major barriers (eFigure 1), financial assistance and access to engaged mentors were among the highest-ranked mitigation strategies (eFigure 5), suggesting these resources may be fundamental to overcoming multiple structural challenges. To address these needs comprehensively, we propose a multilevel approach: at the institutional level, dermatology interest groups could establish centralized databases of research opportunities, mentorship programs, and funding sources. At the national level, dermatology organizations could consider expanding grant programs, developing virtual mentorship networks, and creating opportunities for external students through remote research projects or short-term research rotations. These interventions, informed by both our statistical analyses and applicant feedback, could help create more equitable access to research opportunities in dermatology.

Limitations

A major limitation of this study was that potential dermatology candidates who were deterred by barriers and later decided on a different specialty would not be captured in our data. As these candidates may have faced substantial barriers that caused them to choose a different path, their absence from the current data may indicate that the reported results underpredict the effect size of the true population. Another limitation is the absence of a control group, such as applicants to less competitive specialties, which would provide valuable context for whether the barriers identified are unique to dermatology.

Conclusion

Our study provides compelling evidence that research barriers in dermatology residency applications intersect with demographic factors to influence research engagement and career trajectories. Our findings suggest that without targeted intervention, increasing emphasis on research productivity may exacerbate existing disparities in dermatology. Moving forward, a coordinated effort among institutions, dermatology associations, and dermatology residency programs will be fundamental to ensure that research requirements enhance rather than impede the development of a diverse, qualified dermatology workforce.

Cydnidae is a family of small to medium-sized shield bugs with spiny legs that commonly are known as burrowing bugs (or burrower bugs). The family Cydnidae includes more than 100 genera and approximately 600 species worldwide.¹ These insects are arthropods of the order Hemiptera (suborder: Heteroptera; superfamily: Pentatomoidae) and largely are concentrated in tropical and temperate regions. Approximately 145 species have been recorded in the Neotropical Region and have been included in the subfamilies Amnestinae, Cephalocteinae, and Sehirinae, in addition to Cydnidae.² Burrowing bugs are ovoid in shape and 2 to 20 mm in length and morphologically are well adapted for burrowing. Their life span is 100 to 300 days. Being phytophagous, they burrow to feed on plants and roots. Adult burrowing bugs have wings and can fly. They have specialized glands located in either the abdomen (nymph) or thorax (adult) that secrete odorous chemicals for self-protection.³ The secretions contain hydrocarbonates that function as repellents and danger signals, can cause paralysis in prey, and act as a chemoattractant for mates.^4-6 They also cause hyperpigmentation upon contact with the skin.

In this article, we present a series of cases from the same community to demonstrate the characteristic features of hyperpigmented macules caused by exposure to burrowing bugs. Dermatologists should be aware of this entity to prevent misdiagnosis and unnecessary investigations and treatment.

Case Series

A 36-year-old woman and 6 children (age range, 6-12 years) presented with a widespread, acute, brown-pigmented, macular eruption with lesions that increased in number over a 1-week period. All 7 patients resided in the same locality and were otherwise systemically healthy. Initially, the index case, a 7-year-old girl, was referred to our tertiary care center by a dermatologist with a provisional diagnosis of idiopathic macular eruptive pigmentation. The patient’s mother recalled noticing a tiny black insect on the child's scalp that left pigment on the skin when she crushed it between her fingers. The rest of the patients presented over the next few days: 3 of the children belonged to the same household as the index case, and there was history of all 6 children playing in the neighborhood park during late evening hours. The adult patient was the parent of one of the affected children. The lesions were associated with mild itching and tingling in 3 children but were asymptomatic in the other patients.

Clinical examination of the patients revealed multiple dark- to light-brown, discrete, irregularly shaped macules over the trunk, arms, and soles (eFigure 1). Dermoscopic examination of a pigmented macule showed an irregularly shaped, brownish, structureless area with accentuation of the pigment at skin creases and perieccrine pigmentation (eFigure 2). The pigmentation was unaffected by rubbing with alcohol or water. Clinicoepidemiologic parameters of the patients are summarized in the eTable.

One of the children’s parents conducted a geological examination of the ground in the neighborhood park during evening hours and found tiny burrowing bugs (eFigure 3). When crushed between the fingers, these insects left a similar brownish hyperpigmentation on the skin. The parents were counseled on the nature of the eruption, and the patients were kept under observation for 2 weeks. On follow-up after 5 days, the lesions showed markedly decreased intensity of hyperpigmentation, and no new lesions were observed in any of the 7 patients.

Comment

Pentatomoidae insects generally are benign and harmless to humans. There have been isolated reports of erythematous plaques caused by Antiteuchus mixtus and Edessa maculate.⁷ Malhotra et al⁸ reported the first known series of cases with Cydnidae insect–induced hyperpigmented macules. The reported patients presented with asymptomatic, brown, hyperpigmented macules over exposed sites such as the feet, neck, and chest. All the cases occurred during the monsoon season in tropical and temperate regions of the world, and the patients were characteristically clustered in similar geographic areas. The causative insect was identified as Chilocoris assmuthi Breddin, 1904, belonging to the family Cydnidae. When it was crushed between the fingers, the skin became hyperpigmented, confirming the role of the secretions from the insect in the etiology.⁸

A second case was described by Sonthalia,⁹ who also described the dermoscopic features of hyperpigmented macules caused by burrowing bugs. The lesions showed a stuck-on, clustered appearance of ovoid and bizarre pigmented clods, globules, and granules.⁹ Although the lesions occur mainly over exposed sites, pigmented macules occurring over unusual sites such as the abdomen and back also have been reported in association with burrowing bugs.¹⁰ Characteristically, the lesions initially are faint and darken with time and usually fade within a week. They can be rubbed off with acetone but persist when washed with soap and water. The fleeting nature of the pigmentation also has led to the term transient pseudo-lentigines sign to describe hyperpigmentation caused by burrowing bugs.¹¹

Soil and plants are burrowing bugs’ natural habitats, and the insects typically are seen in vegetation-rich, moist areas adjoining human dwellings (eg, parks, gardens), where clusters of cases can occur. These insects proliferate during the monsoon season in tropical and temperate areas, leading to more cases occurring during these months. 

Compared to prior reports,^8,9 a few of our patients had predominant trunk and neck involvement with an occasional tingling sensation or pruritus while the rest were asymptomatic. Dermoscopic features from our patients shared similar reported features of Cydnidae pigmentation.^4,5 The accentuation of pigment over skin creases seen on dermoscopy was due to accumulation of Cydnidae secretion at these sites. 

The differential diagnosis commonly includes idiopathic macular eruptive pigmentation, which is characterized by an asymptomatic progressive eruption of hyperpigmented macules over the trunk that persists from a few months up to 3 years. Other conditions in the differential include benign conditions such as acral benign melanocytic nevi, lentigines, pigmented purpuric dermatosis, and postinflammatory hyperpigmentation, as well as malignant conditions such as acral melanoma. Dermoscopy is a helpful, easy-to-use tool in differentiating these pigmentation disorders, obviating the need for an invasive investigation such as histopathologic analysis. Simultaneous involvement in a group of people living together or visiting the same place, abrupt onset, predominant involvement of the exposed sites, characteristic clinical and dermoscopic features, self-limiting course, and timing with the monsoon season should suggest a possibility of Cydnidae dermatitis/pigmentation, which can be confirmed by finding the causative bug in the affected locality.

Management

No specific treatment is required for the pigmentation caused by Cydnidae, as it is self-resolving. The macules can, however, be removed with acetone. Patients must be counseled regarding the benign and fleeting nature of this condition, as the abrupt onset may alarm them of a systemic disease. Affected patients should be advised against walking barefoot in areas where the insects can be found. Spraying insecticides in the affected locality also helps to reduce the presence of burrowing bugs.

Cydnidae is a family of small to medium-sized shield bugs with spiny legs that commonly are known as burrowing bugs (or burrower bugs). The family Cydnidae includes more than 100 genera and approximately 600 species worldwide.¹ These insects are arthropods of the order Hemiptera (suborder: Heteroptera; superfamily: Pentatomoidae) and largely are concentrated in tropical and temperate regions. Approximately 145 species have been recorded in the Neotropical Region and have been included in the subfamilies Amnestinae, Cephalocteinae, and Sehirinae, in addition to Cydnidae.² Burrowing bugs are ovoid in shape and 2 to 20 mm in length and morphologically are well adapted for burrowing. Their life span is 100 to 300 days. Being phytophagous, they burrow to feed on plants and roots. Adult burrowing bugs have wings and can fly. They have specialized glands located in either the abdomen (nymph) or thorax (adult) that secrete odorous chemicals for self-protection.³ The secretions contain hydrocarbonates that function as repellents and danger signals, can cause paralysis in prey, and act as a chemoattractant for mates.^4-6 They also cause hyperpigmentation upon contact with the skin.

In this article, we present a series of cases from the same community to demonstrate the characteristic features of hyperpigmented macules caused by exposure to burrowing bugs. Dermatologists should be aware of this entity to prevent misdiagnosis and unnecessary investigations and treatment.

Case Series

A 36-year-old woman and 6 children (age range, 6-12 years) presented with a widespread, acute, brown-pigmented, macular eruption with lesions that increased in number over a 1-week period. All 7 patients resided in the same locality and were otherwise systemically healthy. Initially, the index case, a 7-year-old girl, was referred to our tertiary care center by a dermatologist with a provisional diagnosis of idiopathic macular eruptive pigmentation. The patient’s mother recalled noticing a tiny black insect on the child's scalp that left pigment on the skin when she crushed it between her fingers. The rest of the patients presented over the next few days: 3 of the children belonged to the same household as the index case, and there was history of all 6 children playing in the neighborhood park during late evening hours. The adult patient was the parent of one of the affected children. The lesions were associated with mild itching and tingling in 3 children but were asymptomatic in the other patients.

Clinical examination of the patients revealed multiple dark- to light-brown, discrete, irregularly shaped macules over the trunk, arms, and soles (eFigure 1). Dermoscopic examination of a pigmented macule showed an irregularly shaped, brownish, structureless area with accentuation of the pigment at skin creases and perieccrine pigmentation (eFigure 2). The pigmentation was unaffected by rubbing with alcohol or water. Clinicoepidemiologic parameters of the patients are summarized in the eTable.

One of the children’s parents conducted a geological examination of the ground in the neighborhood park during evening hours and found tiny burrowing bugs (eFigure 3). When crushed between the fingers, these insects left a similar brownish hyperpigmentation on the skin. The parents were counseled on the nature of the eruption, and the patients were kept under observation for 2 weeks. On follow-up after 5 days, the lesions showed markedly decreased intensity of hyperpigmentation, and no new lesions were observed in any of the 7 patients.

Comment

Pentatomoidae insects generally are benign and harmless to humans. There have been isolated reports of erythematous plaques caused by Antiteuchus mixtus and Edessa maculate.⁷ Malhotra et al⁸ reported the first known series of cases with Cydnidae insect–induced hyperpigmented macules. The reported patients presented with asymptomatic, brown, hyperpigmented macules over exposed sites such as the feet, neck, and chest. All the cases occurred during the monsoon season in tropical and temperate regions of the world, and the patients were characteristically clustered in similar geographic areas. The causative insect was identified as Chilocoris assmuthi Breddin, 1904, belonging to the family Cydnidae. When it was crushed between the fingers, the skin became hyperpigmented, confirming the role of the secretions from the insect in the etiology.⁸

A second case was described by Sonthalia,⁹ who also described the dermoscopic features of hyperpigmented macules caused by burrowing bugs. The lesions showed a stuck-on, clustered appearance of ovoid and bizarre pigmented clods, globules, and granules.⁹ Although the lesions occur mainly over exposed sites, pigmented macules occurring over unusual sites such as the abdomen and back also have been reported in association with burrowing bugs.¹⁰ Characteristically, the lesions initially are faint and darken with time and usually fade within a week. They can be rubbed off with acetone but persist when washed with soap and water. The fleeting nature of the pigmentation also has led to the term transient pseudo-lentigines sign to describe hyperpigmentation caused by burrowing bugs.¹¹

Soil and plants are burrowing bugs’ natural habitats, and the insects typically are seen in vegetation-rich, moist areas adjoining human dwellings (eg, parks, gardens), where clusters of cases can occur. These insects proliferate during the monsoon season in tropical and temperate areas, leading to more cases occurring during these months. 

Compared to prior reports,^8,9 a few of our patients had predominant trunk and neck involvement with an occasional tingling sensation or pruritus while the rest were asymptomatic. Dermoscopic features from our patients shared similar reported features of Cydnidae pigmentation.^4,5 The accentuation of pigment over skin creases seen on dermoscopy was due to accumulation of Cydnidae secretion at these sites. 

The differential diagnosis commonly includes idiopathic macular eruptive pigmentation, which is characterized by an asymptomatic progressive eruption of hyperpigmented macules over the trunk that persists from a few months up to 3 years. Other conditions in the differential include benign conditions such as acral benign melanocytic nevi, lentigines, pigmented purpuric dermatosis, and postinflammatory hyperpigmentation, as well as malignant conditions such as acral melanoma. Dermoscopy is a helpful, easy-to-use tool in differentiating these pigmentation disorders, obviating the need for an invasive investigation such as histopathologic analysis. Simultaneous involvement in a group of people living together or visiting the same place, abrupt onset, predominant involvement of the exposed sites, characteristic clinical and dermoscopic features, self-limiting course, and timing with the monsoon season should suggest a possibility of Cydnidae dermatitis/pigmentation, which can be confirmed by finding the causative bug in the affected locality.

Management

No specific treatment is required for the pigmentation caused by Cydnidae, as it is self-resolving. The macules can, however, be removed with acetone. Patients must be counseled regarding the benign and fleeting nature of this condition, as the abrupt onset may alarm them of a systemic disease. Affected patients should be advised against walking barefoot in areas where the insects can be found. Spraying insecticides in the affected locality also helps to reduce the presence of burrowing bugs.

Cydnidae is a family of small to medium-sized shield bugs with spiny legs that commonly are known as burrowing bugs (or burrower bugs). The family Cydnidae includes more than 100 genera and approximately 600 species worldwide.¹ These insects are arthropods of the order Hemiptera (suborder: Heteroptera; superfamily: Pentatomoidae) and largely are concentrated in tropical and temperate regions. Approximately 145 species have been recorded in the Neotropical Region and have been included in the subfamilies Amnestinae, Cephalocteinae, and Sehirinae, in addition to Cydnidae.² Burrowing bugs are ovoid in shape and 2 to 20 mm in length and morphologically are well adapted for burrowing. Their life span is 100 to 300 days. Being phytophagous, they burrow to feed on plants and roots. Adult burrowing bugs have wings and can fly. They have specialized glands located in either the abdomen (nymph) or thorax (adult) that secrete odorous chemicals for self-protection.³ The secretions contain hydrocarbonates that function as repellents and danger signals, can cause paralysis in prey, and act as a chemoattractant for mates.^4-6 They also cause hyperpigmentation upon contact with the skin.

In this article, we present a series of cases from the same community to demonstrate the characteristic features of hyperpigmented macules caused by exposure to burrowing bugs. Dermatologists should be aware of this entity to prevent misdiagnosis and unnecessary investigations and treatment.

Case Series

A 36-year-old woman and 6 children (age range, 6-12 years) presented with a widespread, acute, brown-pigmented, macular eruption with lesions that increased in number over a 1-week period. All 7 patients resided in the same locality and were otherwise systemically healthy. Initially, the index case, a 7-year-old girl, was referred to our tertiary care center by a dermatologist with a provisional diagnosis of idiopathic macular eruptive pigmentation. The patient’s mother recalled noticing a tiny black insect on the child's scalp that left pigment on the skin when she crushed it between her fingers. The rest of the patients presented over the next few days: 3 of the children belonged to the same household as the index case, and there was history of all 6 children playing in the neighborhood park during late evening hours. The adult patient was the parent of one of the affected children. The lesions were associated with mild itching and tingling in 3 children but were asymptomatic in the other patients.

Clinical examination of the patients revealed multiple dark- to light-brown, discrete, irregularly shaped macules over the trunk, arms, and soles (eFigure 1). Dermoscopic examination of a pigmented macule showed an irregularly shaped, brownish, structureless area with accentuation of the pigment at skin creases and perieccrine pigmentation (eFigure 2). The pigmentation was unaffected by rubbing with alcohol or water. Clinicoepidemiologic parameters of the patients are summarized in the eTable.

One of the children’s parents conducted a geological examination of the ground in the neighborhood park during evening hours and found tiny burrowing bugs (eFigure 3). When crushed between the fingers, these insects left a similar brownish hyperpigmentation on the skin. The parents were counseled on the nature of the eruption, and the patients were kept under observation for 2 weeks. On follow-up after 5 days, the lesions showed markedly decreased intensity of hyperpigmentation, and no new lesions were observed in any of the 7 patients.

Comment

Pentatomoidae insects generally are benign and harmless to humans. There have been isolated reports of erythematous plaques caused by Antiteuchus mixtus and Edessa maculate.⁷ Malhotra et al⁸ reported the first known series of cases with Cydnidae insect–induced hyperpigmented macules. The reported patients presented with asymptomatic, brown, hyperpigmented macules over exposed sites such as the feet, neck, and chest. All the cases occurred during the monsoon season in tropical and temperate regions of the world, and the patients were characteristically clustered in similar geographic areas. The causative insect was identified as Chilocoris assmuthi Breddin, 1904, belonging to the family Cydnidae. When it was crushed between the fingers, the skin became hyperpigmented, confirming the role of the secretions from the insect in the etiology.⁸

A second case was described by Sonthalia,⁹ who also described the dermoscopic features of hyperpigmented macules caused by burrowing bugs. The lesions showed a stuck-on, clustered appearance of ovoid and bizarre pigmented clods, globules, and granules.⁹ Although the lesions occur mainly over exposed sites, pigmented macules occurring over unusual sites such as the abdomen and back also have been reported in association with burrowing bugs.¹⁰ Characteristically, the lesions initially are faint and darken with time and usually fade within a week. They can be rubbed off with acetone but persist when washed with soap and water. The fleeting nature of the pigmentation also has led to the term transient pseudo-lentigines sign to describe hyperpigmentation caused by burrowing bugs.¹¹

Soil and plants are burrowing bugs’ natural habitats, and the insects typically are seen in vegetation-rich, moist areas adjoining human dwellings (eg, parks, gardens), where clusters of cases can occur. These insects proliferate during the monsoon season in tropical and temperate areas, leading to more cases occurring during these months. 

Compared to prior reports,^8,9 a few of our patients had predominant trunk and neck involvement with an occasional tingling sensation or pruritus while the rest were asymptomatic. Dermoscopic features from our patients shared similar reported features of Cydnidae pigmentation.^4,5 The accentuation of pigment over skin creases seen on dermoscopy was due to accumulation of Cydnidae secretion at these sites. 

The differential diagnosis commonly includes idiopathic macular eruptive pigmentation, which is characterized by an asymptomatic progressive eruption of hyperpigmented macules over the trunk that persists from a few months up to 3 years. Other conditions in the differential include benign conditions such as acral benign melanocytic nevi, lentigines, pigmented purpuric dermatosis, and postinflammatory hyperpigmentation, as well as malignant conditions such as acral melanoma. Dermoscopy is a helpful, easy-to-use tool in differentiating these pigmentation disorders, obviating the need for an invasive investigation such as histopathologic analysis. Simultaneous involvement in a group of people living together or visiting the same place, abrupt onset, predominant involvement of the exposed sites, characteristic clinical and dermoscopic features, self-limiting course, and timing with the monsoon season should suggest a possibility of Cydnidae dermatitis/pigmentation, which can be confirmed by finding the causative bug in the affected locality.

Management

No specific treatment is required for the pigmentation caused by Cydnidae, as it is self-resolving. The macules can, however, be removed with acetone. Patients must be counseled regarding the benign and fleeting nature of this condition, as the abrupt onset may alarm them of a systemic disease. Affected patients should be advised against walking barefoot in areas where the insects can be found. Spraying insecticides in the affected locality also helps to reduce the presence of burrowing bugs.

Molluscum contagiosum (MC), which is caused by a DNA virus in the Poxviridae family, is a common viral skin infection that primarily affects children.^1-4 The reported incidence and prevalence of MC exhibit notable geographic variation. Worldwide, annual incidence rates per 1000 individuals range from 3.1 to 25, and prevalence ranges from 0.27% to 34.6%.^2-7

Molluscum contagiosum is diagnosed clinically and typically manifests as smooth, flesh-colored papules measuring 2 to 6 mm in diameter with central umbilication. It can manifest as a single lesion or multiple clustered lesions, or in a disseminated pattern. The primary mode of transmission is through contact with skin, lesions, or contaminated personal items, or via self-inoculation. The majority of cases are asymptomatic, but in some patients, MC may be associated with pruritus, tenderness, erythema, or irritation. When present, secondary bacterial infections can cause localized inflammation and pain.^1,3,4 The pathogenesis hinges on MC virus replication within keratinocytes, disrupting cellular differentiation and keratinization. The virus persists in the host by influencing the immune response through various mechanisms, including interference with signaling pathways, apoptosis inhibition, and antigen presentation disruption.^3,4

Molluscum contagiosum typically follows a self-limiting trajectory, resolving over several months to 2 years.^3,4 The resolution timeframe is intricately linked to variables such as the patient’s immune profile, lesion burden, and treatment approach. For symptomatic lesions, a variety of treatment options have been described, including physical ablation (eg, cryotherapy, curettage) and topical agents such as potassium hydroxide, cantharidin, imiquimod, and salicylic acid.^3,4,8,9

Atopic dermatitis (AD) is a common chronic relapsing inflammatory skin disorder. In the United States, its prevalence ranges from 15% to 30% in children and from 2% to 10% in adults, with ongoing evidence of a growing global incidence.^10-14 While AD can emerge at any age, typical onset is during early childhood. The clinical manifestation of AD includes a spectrum of eczematous features, often accompanied by persistent itching. The pathogenesis is multifactorial, involving a complex interplay of genetic, immunologic, and environmental factors. Key contributors to this multifaceted process encompass a compromised epidermal barrier, alterations in the skin microbiome, and an immune dysregulation promoting a type 2 immune response. Epidermal barrier dysfunction can be attributed to various factors, including diminished ceramide production, altered lipid composition, the release of inflammatory mediators, and mechanical damage from the persistent itch-scratch cycle.^10-13,15 These factors or their interplay may enhance the susceptibility of patients with AD to infections. 

Several studies conducted across various geographic regions examining the relationship between MC and AD have reported variable findings.^2,6,7,16-21 Published studies have reported a prevalence of AD in children with MC ranging from 13.2% to 43%.^2,6,7,16-21 Although some studies suggest a higher rate of atopy in patients with MC, not all research has confirmed this association.^16,21 Dohil et al² reported a greater number of MC lesions in children with AD than those without an atopic background. Silverberg²⁰ reported that in 10% (5/50) of children with MC, the onset of AD was triggered, and in 22% (11/50) MC was associated with flares of pre-existing AD.

In this study, we aimed to assess MC infection rates in children with AD, analyze the epidemiologic aspects and severity differences between atopic children with and without MC infection, and compare data from atopic and nonatopic children with MC.

Methods

In this retrospective cohort study, we analyzed the medical records of pediatric patients diagnosed with MC, AD, or both conditions at an outpatient dermatology practice in Netanya, HaSharon, Israel, from September 2013 to August 2022. Data were collected from the electronic medical records and included patient demographics, the clinical presentation of MC and/or AD at diagnosis, and the duration of both conditions. Only patients with complete data and at least 6 months of follow-up were included. Key epidemiologic characteristics assessed included patient sex, age at the initial visit, and age at the onset of MC and/or AD. Diagnoses of MC and AD were established through clinical examinations conducted by dermatologists. The clinical evaluation of AD encompassed the assessment of body surface area involvement (categorized as <5%, 5%-10%, or >10%). Atopic dermatitis severity was classified as mild, moderate, or severe using the validated Investigator Global Assessment Scale for Atopic Dermatitis.²² Clinical evaluation of MC included assessment of the number of lesions (categorized as ≤4, 5-9, or ≥10), presence of inflammatory lesions, and resolution times for individual lesions (categorized as <1 week, several weeks, or unknown), as well as the overall resolution time for all lesions (categorized as <6 months, 6-12 months, 13-18 months, or >18 months). The temporal relationship between the appearance of MC and AD also was assessed.

Statistical Analysis—Numbers and percentages were used for categorical variables. Continuous variables were represented by mean and standard deviation. Categorical variables were compared using the χ² test, and continuous variables between groups were compared using the Student t test. All statistical tests were 2-sided, with statistical significance defined as P≤.05. Statistical analysis was performed using SPSS software version 28 (IBM).

Results

Study Population—A total of 610 children were included in the study; 263 (43%) were female and 347 (57%) were male. The patients ranged in age from 4 months to 10 years, with a mean (SD) age of 4.87 (1.82) years. Five hundred fifty-six (91%) patients had AD, and 336 (55%) had MC. Within this cohort, 274 (45%) children had AD only, 54 (9%) had MC only, and 282 (46%) had both AD and MC. Regarding the temporal sequence, among the 282 children who had both AD and MC, AD preceded MC in 203 (72%) cases, both conditions were diagnosed concomitantly in 43 (15%) cases, and MC preceded AD in 36 (13%) cases. For cases in which the MC diagnosis followed the diagnosis of AD, the mean (SD) time between each diagnosis was 3.17 (1.5) years.

Comparison of Atopic and Nonatopic Children With MC—Although a higher proportion of males were diagnosed with MC (with or without concurrent AD), the differences in sex distribution between the 2 groups did not reach statistical significance. Among all children with MC, the majority (81.5% [274/336]) were aged 1 to 6 years at presentation. Patients with MC as their sole diagnosis had a similar mean age compared with those with concurrent AD. However, a detailed age subgroup analysis revealed a notable distinction: in the group with MC as the sole diagnosis, the majority (95% [51/54]) were younger than 7 years. In contrast, in the combined MC and AD group, MC manifested across a wider age range, with 21% (58/282) of patients being older than 7 years. In MC cases associated with AD, a notably higher lesion count and increased local inflammatory response were observed compared to those without AD. The time for complete resolution of all MC lesions was substantially prolonged in patients with comorbid AD. Specifically, 93% (50/54) of patients with MC without comorbid AD achieved full resolution within 1 year, whereas 52% (146/282) of patients with comorbid AD required more than 1 year for resolution (eTable 1). 

Comparison of Atopic Children With and Without MC—Sex, age distribution, and disease duration showed no differences between atopic patients with and without MC. Atopic patients with MC exhibited greater body surface area involvement and higher validated Investigator Global Assessment Scale for Atopic Dermatitis scores compared to atopic patients without MC (eTable 2).

Comment

This study examined the relationship between MC and AD in pediatric patients, revealing a notable correlation and yielding valuable epidemiologic and clinical insights. Consistent with previous research, our study demonstrated a high prevalence of AD in children with MC.^2,6,7,16-21 Previous studies indicated AD rates of 13% to 43% in pediatric patients with MC, whereas our study found a higher prevalence (84%), signifying a substantial majority of patients with MC in our cohort had AD. This discrepancy arises from factors such as demographic, genetic, and environmental differences, along with differences in access to medical care, referral practices, and diagnostic approaches across health care systems.¹⁴

Our temporal analysis of MC and AD diagnoses offers important insights. In the majority (72% [203/282]) of cases, the diagnosis of AD preceded MC, supporting previous research suggesting that the underlying pathophysiology of AD heightens susceptibility to MC.^15,17-20 Less frequently, MC was diagnosed before or concurrently with AD, indicating that MC may occasionally trigger or exacerbate milder or undiagnosed AD, as previously proposed.²⁰

A notable finding in our study was the expanded age range for MC onset in patients with AD, encompassing older age groups compared to patients with MC as their sole diagnosis, possibly due to persistent immune dysregulation. To the best of our knowledge, this specific observation has not been systematically reported or documented in prior cohort studies. Visible skin lesions of MC may have a psychological impact on patients, influencing self-consciousness and causing embarrassment and emotional distress. This may be more pronounced in older children, who are more aware of their appearance and social perceptions.^23-25 These considerations should play a role in the management of MC. 

Our study revealed that children with AD and MC displayed higher lesion counts, increased local inflammatory responses, and a more protracted resolution period compared to nonatopic children. In more than 50% of children with AD, MC took more than 1 year for resolution, whereas the majority of those without AD achieved resolution within 1 year. These findings may be attributed to AD-related immune dysregulation, influencing the natural course of MC. Consequently, it suggests that while nonatopic children with MC usually are managed through observation, atopic patients may benefit from an intervention-oriented approach. 

Comparing atopic patients with and without MC showed a heightened occurrence of severe and extensive AD among those with concurrent MC. Several factors could contribute to this observation. On one hand, there could be a direct association between the extent and severity of AD, leading to an elevated susceptibility to MC. Conversely, MC might exacerbate immunologic dysregulation and intensify skin inflammation in atopic individuals.²⁰ Additionally, itching related to both disorders may exacerbate inflammation and compromise the epidermal barrier, facilitating the spread of MC. This interplay suggests that each condition exacerbates the other in a self-reinforcing cycle. The importance of patient and caregiver education is underscored by recognizing these interactions. To manage both conditions effectively, health care providers should counsel patients and caregivers on maintaining proper skin care practices such as gentle cleansing with mild, fragrance-free products, regular moisturization, and avoidance of irritants, encourage them to avoid scratching, and recommend adopting an active treatment approach.

Our study had notable strengths. Firstly, a substantial sample size enhanced the statistical reliability of our findings. Additionally, valuable insights into the epidemiology and clinical aspects of AD and MC were obtained by utilizing real-world data from an outpatient dermatology practice. In our study, clinical evaluations covered body surface area involvement and disease severity for AD while also assessing lesion counts and the presence of inflammatory lesions for MC. This comprehensive approach facilitated a thorough analysis of both conditions. The extended data collection period not only allowed for observation of their clinical course and duration, but also enabled a detailed assessment of their interplay.

Our study also had several limitations. Primarily, its retrospective design relied on the accuracy and comprehensiveness of medical records, which may have introduced bias. The exclusion of some patients due to incomplete data further increased the potential for selection bias. Additionally, this study was conducted in a single outpatient dermatology practice in Israel, resulting in a study population composed predominantly of Jewish patients (94%), with a minority (6%) of Arab patients. Other ethnic groups, including Black, Asian, and Hispanic populations, were not represented. This reflects the country’s demographic composition rather than an intentional selection bias. However, the limited ethnic diversity reduces the generalizability of our findings. Differences in demographics, coding practices, health care utilization (eg, timeliness of seeking care, access to dermatology services), and treatment strategies also may impact the observed prevalence, clinical characteristics, and patient outcomes. Furthermore, while our study highlighted the potential advantages of a proactive treatment approach for atopic children with MC, it did not evaluate specific treatment protocols. Future research should aim to confirm the most efficacious therapeutic strategies for managing MC in atopic individuals and to include a more diverse population to better understand the applicability of findings across various ethnic groups.

Conclusion

Our study found a high prevalence of AD in children with MC and a strong bidirectional relationship between these conditions. Pediatric patients with AD display a broader age range for MC, greater lesion burden, increased local inflammatory responses, prolonged resolution times, and more extensive and severe AD.

Recognizing the interplay between MC and AD is crucial, highlighting the importance of health care providers educating patients and caregivers. Emphasizing skin hygiene, discouraging scratching, and implementing proactive treatment approaches can enhance the outcomes of both conditions. Further research into the underlying mechanisms of this association and effective therapeutic strategies for MC in atopic individuals is warranted.

Acknowledgments—The authors thank Zvi Segal, MD (Tel Hashomer, Israel) for his insightful contribution to the statistical analysis of the results. We would like to express our appreciation to the dedicated team of the dermatology practice in Netanya for the support throughout the performance of the study. Additionally, we thank all study participants and their parents for their participation and contribution to our research.

Molluscum contagiosum (MC), which is caused by a DNA virus in the Poxviridae family, is a common viral skin infection that primarily affects children.^1-4 The reported incidence and prevalence of MC exhibit notable geographic variation. Worldwide, annual incidence rates per 1000 individuals range from 3.1 to 25, and prevalence ranges from 0.27% to 34.6%.^2-7

Molluscum contagiosum is diagnosed clinically and typically manifests as smooth, flesh-colored papules measuring 2 to 6 mm in diameter with central umbilication. It can manifest as a single lesion or multiple clustered lesions, or in a disseminated pattern. The primary mode of transmission is through contact with skin, lesions, or contaminated personal items, or via self-inoculation. The majority of cases are asymptomatic, but in some patients, MC may be associated with pruritus, tenderness, erythema, or irritation. When present, secondary bacterial infections can cause localized inflammation and pain.^1,3,4 The pathogenesis hinges on MC virus replication within keratinocytes, disrupting cellular differentiation and keratinization. The virus persists in the host by influencing the immune response through various mechanisms, including interference with signaling pathways, apoptosis inhibition, and antigen presentation disruption.^3,4

Molluscum contagiosum typically follows a self-limiting trajectory, resolving over several months to 2 years.^3,4 The resolution timeframe is intricately linked to variables such as the patient’s immune profile, lesion burden, and treatment approach. For symptomatic lesions, a variety of treatment options have been described, including physical ablation (eg, cryotherapy, curettage) and topical agents such as potassium hydroxide, cantharidin, imiquimod, and salicylic acid.^3,4,8,9

Atopic dermatitis (AD) is a common chronic relapsing inflammatory skin disorder. In the United States, its prevalence ranges from 15% to 30% in children and from 2% to 10% in adults, with ongoing evidence of a growing global incidence.^10-14 While AD can emerge at any age, typical onset is during early childhood. The clinical manifestation of AD includes a spectrum of eczematous features, often accompanied by persistent itching. The pathogenesis is multifactorial, involving a complex interplay of genetic, immunologic, and environmental factors. Key contributors to this multifaceted process encompass a compromised epidermal barrier, alterations in the skin microbiome, and an immune dysregulation promoting a type 2 immune response. Epidermal barrier dysfunction can be attributed to various factors, including diminished ceramide production, altered lipid composition, the release of inflammatory mediators, and mechanical damage from the persistent itch-scratch cycle.^10-13,15 These factors or their interplay may enhance the susceptibility of patients with AD to infections. 

Several studies conducted across various geographic regions examining the relationship between MC and AD have reported variable findings.^2,6,7,16-21 Published studies have reported a prevalence of AD in children with MC ranging from 13.2% to 43%.^2,6,7,16-21 Although some studies suggest a higher rate of atopy in patients with MC, not all research has confirmed this association.^16,21 Dohil et al² reported a greater number of MC lesions in children with AD than those without an atopic background. Silverberg²⁰ reported that in 10% (5/50) of children with MC, the onset of AD was triggered, and in 22% (11/50) MC was associated with flares of pre-existing AD.

In this study, we aimed to assess MC infection rates in children with AD, analyze the epidemiologic aspects and severity differences between atopic children with and without MC infection, and compare data from atopic and nonatopic children with MC.

Methods

In this retrospective cohort study, we analyzed the medical records of pediatric patients diagnosed with MC, AD, or both conditions at an outpatient dermatology practice in Netanya, HaSharon, Israel, from September 2013 to August 2022. Data were collected from the electronic medical records and included patient demographics, the clinical presentation of MC and/or AD at diagnosis, and the duration of both conditions. Only patients with complete data and at least 6 months of follow-up were included. Key epidemiologic characteristics assessed included patient sex, age at the initial visit, and age at the onset of MC and/or AD. Diagnoses of MC and AD were established through clinical examinations conducted by dermatologists. The clinical evaluation of AD encompassed the assessment of body surface area involvement (categorized as <5%, 5%-10%, or >10%). Atopic dermatitis severity was classified as mild, moderate, or severe using the validated Investigator Global Assessment Scale for Atopic Dermatitis.²² Clinical evaluation of MC included assessment of the number of lesions (categorized as ≤4, 5-9, or ≥10), presence of inflammatory lesions, and resolution times for individual lesions (categorized as <1 week, several weeks, or unknown), as well as the overall resolution time for all lesions (categorized as <6 months, 6-12 months, 13-18 months, or >18 months). The temporal relationship between the appearance of MC and AD also was assessed.

Statistical Analysis—Numbers and percentages were used for categorical variables. Continuous variables were represented by mean and standard deviation. Categorical variables were compared using the χ² test, and continuous variables between groups were compared using the Student t test. All statistical tests were 2-sided, with statistical significance defined as P≤.05. Statistical analysis was performed using SPSS software version 28 (IBM).

Results

Study Population—A total of 610 children were included in the study; 263 (43%) were female and 347 (57%) were male. The patients ranged in age from 4 months to 10 years, with a mean (SD) age of 4.87 (1.82) years. Five hundred fifty-six (91%) patients had AD, and 336 (55%) had MC. Within this cohort, 274 (45%) children had AD only, 54 (9%) had MC only, and 282 (46%) had both AD and MC. Regarding the temporal sequence, among the 282 children who had both AD and MC, AD preceded MC in 203 (72%) cases, both conditions were diagnosed concomitantly in 43 (15%) cases, and MC preceded AD in 36 (13%) cases. For cases in which the MC diagnosis followed the diagnosis of AD, the mean (SD) time between each diagnosis was 3.17 (1.5) years.

Comparison of Atopic and Nonatopic Children With MC—Although a higher proportion of males were diagnosed with MC (with or without concurrent AD), the differences in sex distribution between the 2 groups did not reach statistical significance. Among all children with MC, the majority (81.5% [274/336]) were aged 1 to 6 years at presentation. Patients with MC as their sole diagnosis had a similar mean age compared with those with concurrent AD. However, a detailed age subgroup analysis revealed a notable distinction: in the group with MC as the sole diagnosis, the majority (95% [51/54]) were younger than 7 years. In contrast, in the combined MC and AD group, MC manifested across a wider age range, with 21% (58/282) of patients being older than 7 years. In MC cases associated with AD, a notably higher lesion count and increased local inflammatory response were observed compared to those without AD. The time for complete resolution of all MC lesions was substantially prolonged in patients with comorbid AD. Specifically, 93% (50/54) of patients with MC without comorbid AD achieved full resolution within 1 year, whereas 52% (146/282) of patients with comorbid AD required more than 1 year for resolution (eTable 1). 

Comparison of Atopic Children With and Without MC—Sex, age distribution, and disease duration showed no differences between atopic patients with and without MC. Atopic patients with MC exhibited greater body surface area involvement and higher validated Investigator Global Assessment Scale for Atopic Dermatitis scores compared to atopic patients without MC (eTable 2).

Comment

This study examined the relationship between MC and AD in pediatric patients, revealing a notable correlation and yielding valuable epidemiologic and clinical insights. Consistent with previous research, our study demonstrated a high prevalence of AD in children with MC.^2,6,7,16-21 Previous studies indicated AD rates of 13% to 43% in pediatric patients with MC, whereas our study found a higher prevalence (84%), signifying a substantial majority of patients with MC in our cohort had AD. This discrepancy arises from factors such as demographic, genetic, and environmental differences, along with differences in access to medical care, referral practices, and diagnostic approaches across health care systems.¹⁴

Our temporal analysis of MC and AD diagnoses offers important insights. In the majority (72% [203/282]) of cases, the diagnosis of AD preceded MC, supporting previous research suggesting that the underlying pathophysiology of AD heightens susceptibility to MC.^15,17-20 Less frequently, MC was diagnosed before or concurrently with AD, indicating that MC may occasionally trigger or exacerbate milder or undiagnosed AD, as previously proposed.²⁰

A notable finding in our study was the expanded age range for MC onset in patients with AD, encompassing older age groups compared to patients with MC as their sole diagnosis, possibly due to persistent immune dysregulation. To the best of our knowledge, this specific observation has not been systematically reported or documented in prior cohort studies. Visible skin lesions of MC may have a psychological impact on patients, influencing self-consciousness and causing embarrassment and emotional distress. This may be more pronounced in older children, who are more aware of their appearance and social perceptions.^23-25 These considerations should play a role in the management of MC. 

Our study revealed that children with AD and MC displayed higher lesion counts, increased local inflammatory responses, and a more protracted resolution period compared to nonatopic children. In more than 50% of children with AD, MC took more than 1 year for resolution, whereas the majority of those without AD achieved resolution within 1 year. These findings may be attributed to AD-related immune dysregulation, influencing the natural course of MC. Consequently, it suggests that while nonatopic children with MC usually are managed through observation, atopic patients may benefit from an intervention-oriented approach. 

Comparing atopic patients with and without MC showed a heightened occurrence of severe and extensive AD among those with concurrent MC. Several factors could contribute to this observation. On one hand, there could be a direct association between the extent and severity of AD, leading to an elevated susceptibility to MC. Conversely, MC might exacerbate immunologic dysregulation and intensify skin inflammation in atopic individuals.²⁰ Additionally, itching related to both disorders may exacerbate inflammation and compromise the epidermal barrier, facilitating the spread of MC. This interplay suggests that each condition exacerbates the other in a self-reinforcing cycle. The importance of patient and caregiver education is underscored by recognizing these interactions. To manage both conditions effectively, health care providers should counsel patients and caregivers on maintaining proper skin care practices such as gentle cleansing with mild, fragrance-free products, regular moisturization, and avoidance of irritants, encourage them to avoid scratching, and recommend adopting an active treatment approach.

Our study had notable strengths. Firstly, a substantial sample size enhanced the statistical reliability of our findings. Additionally, valuable insights into the epidemiology and clinical aspects of AD and MC were obtained by utilizing real-world data from an outpatient dermatology practice. In our study, clinical evaluations covered body surface area involvement and disease severity for AD while also assessing lesion counts and the presence of inflammatory lesions for MC. This comprehensive approach facilitated a thorough analysis of both conditions. The extended data collection period not only allowed for observation of their clinical course and duration, but also enabled a detailed assessment of their interplay.

Our study also had several limitations. Primarily, its retrospective design relied on the accuracy and comprehensiveness of medical records, which may have introduced bias. The exclusion of some patients due to incomplete data further increased the potential for selection bias. Additionally, this study was conducted in a single outpatient dermatology practice in Israel, resulting in a study population composed predominantly of Jewish patients (94%), with a minority (6%) of Arab patients. Other ethnic groups, including Black, Asian, and Hispanic populations, were not represented. This reflects the country’s demographic composition rather than an intentional selection bias. However, the limited ethnic diversity reduces the generalizability of our findings. Differences in demographics, coding practices, health care utilization (eg, timeliness of seeking care, access to dermatology services), and treatment strategies also may impact the observed prevalence, clinical characteristics, and patient outcomes. Furthermore, while our study highlighted the potential advantages of a proactive treatment approach for atopic children with MC, it did not evaluate specific treatment protocols. Future research should aim to confirm the most efficacious therapeutic strategies for managing MC in atopic individuals and to include a more diverse population to better understand the applicability of findings across various ethnic groups.

Conclusion

Our study found a high prevalence of AD in children with MC and a strong bidirectional relationship between these conditions. Pediatric patients with AD display a broader age range for MC, greater lesion burden, increased local inflammatory responses, prolonged resolution times, and more extensive and severe AD.

Recognizing the interplay between MC and AD is crucial, highlighting the importance of health care providers educating patients and caregivers. Emphasizing skin hygiene, discouraging scratching, and implementing proactive treatment approaches can enhance the outcomes of both conditions. Further research into the underlying mechanisms of this association and effective therapeutic strategies for MC in atopic individuals is warranted.

Acknowledgments—The authors thank Zvi Segal, MD (Tel Hashomer, Israel) for his insightful contribution to the statistical analysis of the results. We would like to express our appreciation to the dedicated team of the dermatology practice in Netanya for the support throughout the performance of the study. Additionally, we thank all study participants and their parents for their participation and contribution to our research.

Molluscum contagiosum (MC), which is caused by a DNA virus in the Poxviridae family, is a common viral skin infection that primarily affects children.^1-4 The reported incidence and prevalence of MC exhibit notable geographic variation. Worldwide, annual incidence rates per 1000 individuals range from 3.1 to 25, and prevalence ranges from 0.27% to 34.6%.^2-7

Molluscum contagiosum is diagnosed clinically and typically manifests as smooth, flesh-colored papules measuring 2 to 6 mm in diameter with central umbilication. It can manifest as a single lesion or multiple clustered lesions, or in a disseminated pattern. The primary mode of transmission is through contact with skin, lesions, or contaminated personal items, or via self-inoculation. The majority of cases are asymptomatic, but in some patients, MC may be associated with pruritus, tenderness, erythema, or irritation. When present, secondary bacterial infections can cause localized inflammation and pain.^1,3,4 The pathogenesis hinges on MC virus replication within keratinocytes, disrupting cellular differentiation and keratinization. The virus persists in the host by influencing the immune response through various mechanisms, including interference with signaling pathways, apoptosis inhibition, and antigen presentation disruption.^3,4

Molluscum contagiosum typically follows a self-limiting trajectory, resolving over several months to 2 years.^3,4 The resolution timeframe is intricately linked to variables such as the patient’s immune profile, lesion burden, and treatment approach. For symptomatic lesions, a variety of treatment options have been described, including physical ablation (eg, cryotherapy, curettage) and topical agents such as potassium hydroxide, cantharidin, imiquimod, and salicylic acid.^3,4,8,9

Atopic dermatitis (AD) is a common chronic relapsing inflammatory skin disorder. In the United States, its prevalence ranges from 15% to 30% in children and from 2% to 10% in adults, with ongoing evidence of a growing global incidence.^10-14 While AD can emerge at any age, typical onset is during early childhood. The clinical manifestation of AD includes a spectrum of eczematous features, often accompanied by persistent itching. The pathogenesis is multifactorial, involving a complex interplay of genetic, immunologic, and environmental factors. Key contributors to this multifaceted process encompass a compromised epidermal barrier, alterations in the skin microbiome, and an immune dysregulation promoting a type 2 immune response. Epidermal barrier dysfunction can be attributed to various factors, including diminished ceramide production, altered lipid composition, the release of inflammatory mediators, and mechanical damage from the persistent itch-scratch cycle.^10-13,15 These factors or their interplay may enhance the susceptibility of patients with AD to infections. 

Several studies conducted across various geographic regions examining the relationship between MC and AD have reported variable findings.^2,6,7,16-21 Published studies have reported a prevalence of AD in children with MC ranging from 13.2% to 43%.^2,6,7,16-21 Although some studies suggest a higher rate of atopy in patients with MC, not all research has confirmed this association.^16,21 Dohil et al² reported a greater number of MC lesions in children with AD than those without an atopic background. Silverberg²⁰ reported that in 10% (5/50) of children with MC, the onset of AD was triggered, and in 22% (11/50) MC was associated with flares of pre-existing AD.

In this study, we aimed to assess MC infection rates in children with AD, analyze the epidemiologic aspects and severity differences between atopic children with and without MC infection, and compare data from atopic and nonatopic children with MC.

Methods

In this retrospective cohort study, we analyzed the medical records of pediatric patients diagnosed with MC, AD, or both conditions at an outpatient dermatology practice in Netanya, HaSharon, Israel, from September 2013 to August 2022. Data were collected from the electronic medical records and included patient demographics, the clinical presentation of MC and/or AD at diagnosis, and the duration of both conditions. Only patients with complete data and at least 6 months of follow-up were included. Key epidemiologic characteristics assessed included patient sex, age at the initial visit, and age at the onset of MC and/or AD. Diagnoses of MC and AD were established through clinical examinations conducted by dermatologists. The clinical evaluation of AD encompassed the assessment of body surface area involvement (categorized as <5%, 5%-10%, or >10%). Atopic dermatitis severity was classified as mild, moderate, or severe using the validated Investigator Global Assessment Scale for Atopic Dermatitis.²² Clinical evaluation of MC included assessment of the number of lesions (categorized as ≤4, 5-9, or ≥10), presence of inflammatory lesions, and resolution times for individual lesions (categorized as <1 week, several weeks, or unknown), as well as the overall resolution time for all lesions (categorized as <6 months, 6-12 months, 13-18 months, or >18 months). The temporal relationship between the appearance of MC and AD also was assessed.

Statistical Analysis—Numbers and percentages were used for categorical variables. Continuous variables were represented by mean and standard deviation. Categorical variables were compared using the χ² test, and continuous variables between groups were compared using the Student t test. All statistical tests were 2-sided, with statistical significance defined as P≤.05. Statistical analysis was performed using SPSS software version 28 (IBM).

Results

Study Population—A total of 610 children were included in the study; 263 (43%) were female and 347 (57%) were male. The patients ranged in age from 4 months to 10 years, with a mean (SD) age of 4.87 (1.82) years. Five hundred fifty-six (91%) patients had AD, and 336 (55%) had MC. Within this cohort, 274 (45%) children had AD only, 54 (9%) had MC only, and 282 (46%) had both AD and MC. Regarding the temporal sequence, among the 282 children who had both AD and MC, AD preceded MC in 203 (72%) cases, both conditions were diagnosed concomitantly in 43 (15%) cases, and MC preceded AD in 36 (13%) cases. For cases in which the MC diagnosis followed the diagnosis of AD, the mean (SD) time between each diagnosis was 3.17 (1.5) years.

Comparison of Atopic and Nonatopic Children With MC—Although a higher proportion of males were diagnosed with MC (with or without concurrent AD), the differences in sex distribution between the 2 groups did not reach statistical significance. Among all children with MC, the majority (81.5% [274/336]) were aged 1 to 6 years at presentation. Patients with MC as their sole diagnosis had a similar mean age compared with those with concurrent AD. However, a detailed age subgroup analysis revealed a notable distinction: in the group with MC as the sole diagnosis, the majority (95% [51/54]) were younger than 7 years. In contrast, in the combined MC and AD group, MC manifested across a wider age range, with 21% (58/282) of patients being older than 7 years. In MC cases associated with AD, a notably higher lesion count and increased local inflammatory response were observed compared to those without AD. The time for complete resolution of all MC lesions was substantially prolonged in patients with comorbid AD. Specifically, 93% (50/54) of patients with MC without comorbid AD achieved full resolution within 1 year, whereas 52% (146/282) of patients with comorbid AD required more than 1 year for resolution (eTable 1). 

Comparison of Atopic Children With and Without MC—Sex, age distribution, and disease duration showed no differences between atopic patients with and without MC. Atopic patients with MC exhibited greater body surface area involvement and higher validated Investigator Global Assessment Scale for Atopic Dermatitis scores compared to atopic patients without MC (eTable 2).

Comment

This study examined the relationship between MC and AD in pediatric patients, revealing a notable correlation and yielding valuable epidemiologic and clinical insights. Consistent with previous research, our study demonstrated a high prevalence of AD in children with MC.^2,6,7,16-21 Previous studies indicated AD rates of 13% to 43% in pediatric patients with MC, whereas our study found a higher prevalence (84%), signifying a substantial majority of patients with MC in our cohort had AD. This discrepancy arises from factors such as demographic, genetic, and environmental differences, along with differences in access to medical care, referral practices, and diagnostic approaches across health care systems.¹⁴

Our temporal analysis of MC and AD diagnoses offers important insights. In the majority (72% [203/282]) of cases, the diagnosis of AD preceded MC, supporting previous research suggesting that the underlying pathophysiology of AD heightens susceptibility to MC.^15,17-20 Less frequently, MC was diagnosed before or concurrently with AD, indicating that MC may occasionally trigger or exacerbate milder or undiagnosed AD, as previously proposed.²⁰

A notable finding in our study was the expanded age range for MC onset in patients with AD, encompassing older age groups compared to patients with MC as their sole diagnosis, possibly due to persistent immune dysregulation. To the best of our knowledge, this specific observation has not been systematically reported or documented in prior cohort studies. Visible skin lesions of MC may have a psychological impact on patients, influencing self-consciousness and causing embarrassment and emotional distress. This may be more pronounced in older children, who are more aware of their appearance and social perceptions.^23-25 These considerations should play a role in the management of MC. 

Our study revealed that children with AD and MC displayed higher lesion counts, increased local inflammatory responses, and a more protracted resolution period compared to nonatopic children. In more than 50% of children with AD, MC took more than 1 year for resolution, whereas the majority of those without AD achieved resolution within 1 year. These findings may be attributed to AD-related immune dysregulation, influencing the natural course of MC. Consequently, it suggests that while nonatopic children with MC usually are managed through observation, atopic patients may benefit from an intervention-oriented approach. 

Comparing atopic patients with and without MC showed a heightened occurrence of severe and extensive AD among those with concurrent MC. Several factors could contribute to this observation. On one hand, there could be a direct association between the extent and severity of AD, leading to an elevated susceptibility to MC. Conversely, MC might exacerbate immunologic dysregulation and intensify skin inflammation in atopic individuals.²⁰ Additionally, itching related to both disorders may exacerbate inflammation and compromise the epidermal barrier, facilitating the spread of MC. This interplay suggests that each condition exacerbates the other in a self-reinforcing cycle. The importance of patient and caregiver education is underscored by recognizing these interactions. To manage both conditions effectively, health care providers should counsel patients and caregivers on maintaining proper skin care practices such as gentle cleansing with mild, fragrance-free products, regular moisturization, and avoidance of irritants, encourage them to avoid scratching, and recommend adopting an active treatment approach.

Our study had notable strengths. Firstly, a substantial sample size enhanced the statistical reliability of our findings. Additionally, valuable insights into the epidemiology and clinical aspects of AD and MC were obtained by utilizing real-world data from an outpatient dermatology practice. In our study, clinical evaluations covered body surface area involvement and disease severity for AD while also assessing lesion counts and the presence of inflammatory lesions for MC. This comprehensive approach facilitated a thorough analysis of both conditions. The extended data collection period not only allowed for observation of their clinical course and duration, but also enabled a detailed assessment of their interplay.

Our study also had several limitations. Primarily, its retrospective design relied on the accuracy and comprehensiveness of medical records, which may have introduced bias. The exclusion of some patients due to incomplete data further increased the potential for selection bias. Additionally, this study was conducted in a single outpatient dermatology practice in Israel, resulting in a study population composed predominantly of Jewish patients (94%), with a minority (6%) of Arab patients. Other ethnic groups, including Black, Asian, and Hispanic populations, were not represented. This reflects the country’s demographic composition rather than an intentional selection bias. However, the limited ethnic diversity reduces the generalizability of our findings. Differences in demographics, coding practices, health care utilization (eg, timeliness of seeking care, access to dermatology services), and treatment strategies also may impact the observed prevalence, clinical characteristics, and patient outcomes. Furthermore, while our study highlighted the potential advantages of a proactive treatment approach for atopic children with MC, it did not evaluate specific treatment protocols. Future research should aim to confirm the most efficacious therapeutic strategies for managing MC in atopic individuals and to include a more diverse population to better understand the applicability of findings across various ethnic groups.

Conclusion

Our study found a high prevalence of AD in children with MC and a strong bidirectional relationship between these conditions. Pediatric patients with AD display a broader age range for MC, greater lesion burden, increased local inflammatory responses, prolonged resolution times, and more extensive and severe AD.

Recognizing the interplay between MC and AD is crucial, highlighting the importance of health care providers educating patients and caregivers. Emphasizing skin hygiene, discouraging scratching, and implementing proactive treatment approaches can enhance the outcomes of both conditions. Further research into the underlying mechanisms of this association and effective therapeutic strategies for MC in atopic individuals is warranted.

Acknowledgments—The authors thank Zvi Segal, MD (Tel Hashomer, Israel) for his insightful contribution to the statistical analysis of the results. We would like to express our appreciation to the dedicated team of the dermatology practice in Netanya for the support throughout the performance of the study. Additionally, we thank all study participants and their parents for their participation and contribution to our research.

Practice Gap

Pain during minimally invasive dermatologic procedures such as lidocaine injections, cryotherapy, nail unit injections, and cosmetic procedures including neurotoxin injections can cause patient discomfort leading to procedural anxiety, poor compliance with treatment regimens, and avoidance of necessary care. Current solutions to manage pain during dermatologic procedures present several limitations; for example, topical anesthetics seldom alleviate procedural pain,¹ particularly in sensitive areas (eg, nail unit, face) or for patients with a needle phobia. Additionally, topical anesthetics often require up to 2 hours to take effect, making them impractical for quick outpatient procedures. Other pain reduction strategies including vibration devices or cold sprays^2,3 can be effective but are an added expense to the physician or clinic, which may preclude their use in resource-limited settings. Psychological distraction techniques such as deep breathing require active patient participation and might reinforce pain expectations and increase patient anxiety.⁴ Given these challenges, there is a need for effective, affordable, nonpharmacologic pain reduction strategies that can be integrated seamlessly into clinical practice to enhance the patient experience.

The Technique

Tapping is a simple noninvasive distraction technique that may alleviate procedural pain by exploiting the gate control theory of pain.⁵ According to this theory, tactile stimuli activate mechanoreceptors that send inhibitory signals to the spinal cord, effectively closing the gate to pain transmission. Unlike the Helfer skin tap technique,⁶ which involves 15 preinjection taps and 3 postinjection taps directly on the injection site, our approach targets distant bony prominences. This modification allows for immediate needle insertion without interfering with the sterile field or increasing the risk for needlestick injuries from tapping near the injection site. Bony sites such as the shoulder or knee are ideal for this technique due to their high density and rigidity that efficiently transmit tactile stimuli––similar to how sound travels faster through solids than through liquids or gases.⁷

To implement this technique in practice, we first stabilize the injection site to reduce movement from tapping. This can be done by stabilizing the injection site (eg, resting the hand on an instrument stand during a nail unit injection). A second person—such as a medical assistant, medical student, resident, or even the patient’s family member—taps at a distant site at least an arm’s length away from the injection site (Figure). The tapping pressure should be firm enough for the patient to feel the vibration but not forceful enough that it becomes unpleasant or disrupts the injection area. Tapping starts just before needle insertion and continues through the injection. No warning is given to the patient, as the surprise element may help distract them from pain. Varying the rhythm, intensity, or location of the tapping can enhance its distracting effect. 

This tapping technique can be effectively combined with other pain reduction strategies in a multimodal approach; for example, when used concurrently with topical anesthetics, both the central (tapping) and peripheral (anesthetic) pain pathways are addressed, potentially yielding additive effects. For patients with a needle ­phobia, pairing tapping with cognitive distraction (eg, talkesthesia) may further reduce anxiety. In our nail specialty clinic at Weill Cornell Medicine (New York, New York), we often combine tapping with cold sprays and talkesthesia, which improves patient comfort without prolonging the visit. Importantly, the technique enables seamless integration with most pharmacologic and nonpharmacologic methods, eliminating the need for additional patient education or procedure time.

Practice Implications

The tapping technique described here is free, easy to implement, and requires no additional resources aside from another person to tap the patient during the procedure. It can be used for a wide range of dermatologic procedures, including biopsies, intralesional injections, and cosmetic treatments, including neurotoxin injections. The minimal learning curve and ease of integration into procedural workflows make this technique a valuable tool for dermatologists aiming to improve patient comfort without disrupting workflow. In our practice, we have observed that tapping reduces self-reported pain and helps ease anxiety, particularly in patients with a needle phobia. Its simplicity and accessibility make it a valuable addition to a wide range of dermatologic procedures. Prospective studies investigating patient-reported outcomes could help establish this technique’s role in clinical practice.

Practice Gap

Pain during minimally invasive dermatologic procedures such as lidocaine injections, cryotherapy, nail unit injections, and cosmetic procedures including neurotoxin injections can cause patient discomfort leading to procedural anxiety, poor compliance with treatment regimens, and avoidance of necessary care. Current solutions to manage pain during dermatologic procedures present several limitations; for example, topical anesthetics seldom alleviate procedural pain,¹ particularly in sensitive areas (eg, nail unit, face) or for patients with a needle phobia. Additionally, topical anesthetics often require up to 2 hours to take effect, making them impractical for quick outpatient procedures. Other pain reduction strategies including vibration devices or cold sprays^2,3 can be effective but are an added expense to the physician or clinic, which may preclude their use in resource-limited settings. Psychological distraction techniques such as deep breathing require active patient participation and might reinforce pain expectations and increase patient anxiety.⁴ Given these challenges, there is a need for effective, affordable, nonpharmacologic pain reduction strategies that can be integrated seamlessly into clinical practice to enhance the patient experience.

The Technique

Tapping is a simple noninvasive distraction technique that may alleviate procedural pain by exploiting the gate control theory of pain.⁵ According to this theory, tactile stimuli activate mechanoreceptors that send inhibitory signals to the spinal cord, effectively closing the gate to pain transmission. Unlike the Helfer skin tap technique,⁶ which involves 15 preinjection taps and 3 postinjection taps directly on the injection site, our approach targets distant bony prominences. This modification allows for immediate needle insertion without interfering with the sterile field or increasing the risk for needlestick injuries from tapping near the injection site. Bony sites such as the shoulder or knee are ideal for this technique due to their high density and rigidity that efficiently transmit tactile stimuli––similar to how sound travels faster through solids than through liquids or gases.⁷

To implement this technique in practice, we first stabilize the injection site to reduce movement from tapping. This can be done by stabilizing the injection site (eg, resting the hand on an instrument stand during a nail unit injection). A second person—such as a medical assistant, medical student, resident, or even the patient’s family member—taps at a distant site at least an arm’s length away from the injection site (Figure). The tapping pressure should be firm enough for the patient to feel the vibration but not forceful enough that it becomes unpleasant or disrupts the injection area. Tapping starts just before needle insertion and continues through the injection. No warning is given to the patient, as the surprise element may help distract them from pain. Varying the rhythm, intensity, or location of the tapping can enhance its distracting effect. 

This tapping technique can be effectively combined with other pain reduction strategies in a multimodal approach; for example, when used concurrently with topical anesthetics, both the central (tapping) and peripheral (anesthetic) pain pathways are addressed, potentially yielding additive effects. For patients with a needle ­phobia, pairing tapping with cognitive distraction (eg, talkesthesia) may further reduce anxiety. In our nail specialty clinic at Weill Cornell Medicine (New York, New York), we often combine tapping with cold sprays and talkesthesia, which improves patient comfort without prolonging the visit. Importantly, the technique enables seamless integration with most pharmacologic and nonpharmacologic methods, eliminating the need for additional patient education or procedure time.

Practice Implications

The tapping technique described here is free, easy to implement, and requires no additional resources aside from another person to tap the patient during the procedure. It can be used for a wide range of dermatologic procedures, including biopsies, intralesional injections, and cosmetic treatments, including neurotoxin injections. The minimal learning curve and ease of integration into procedural workflows make this technique a valuable tool for dermatologists aiming to improve patient comfort without disrupting workflow. In our practice, we have observed that tapping reduces self-reported pain and helps ease anxiety, particularly in patients with a needle phobia. Its simplicity and accessibility make it a valuable addition to a wide range of dermatologic procedures. Prospective studies investigating patient-reported outcomes could help establish this technique’s role in clinical practice.

Practice Gap

Pain during minimally invasive dermatologic procedures such as lidocaine injections, cryotherapy, nail unit injections, and cosmetic procedures including neurotoxin injections can cause patient discomfort leading to procedural anxiety, poor compliance with treatment regimens, and avoidance of necessary care. Current solutions to manage pain during dermatologic procedures present several limitations; for example, topical anesthetics seldom alleviate procedural pain,¹ particularly in sensitive areas (eg, nail unit, face) or for patients with a needle phobia. Additionally, topical anesthetics often require up to 2 hours to take effect, making them impractical for quick outpatient procedures. Other pain reduction strategies including vibration devices or cold sprays^2,3 can be effective but are an added expense to the physician or clinic, which may preclude their use in resource-limited settings. Psychological distraction techniques such as deep breathing require active patient participation and might reinforce pain expectations and increase patient anxiety.⁴ Given these challenges, there is a need for effective, affordable, nonpharmacologic pain reduction strategies that can be integrated seamlessly into clinical practice to enhance the patient experience.

The Technique

Tapping is a simple noninvasive distraction technique that may alleviate procedural pain by exploiting the gate control theory of pain.⁵ According to this theory, tactile stimuli activate mechanoreceptors that send inhibitory signals to the spinal cord, effectively closing the gate to pain transmission. Unlike the Helfer skin tap technique,⁶ which involves 15 preinjection taps and 3 postinjection taps directly on the injection site, our approach targets distant bony prominences. This modification allows for immediate needle insertion without interfering with the sterile field or increasing the risk for needlestick injuries from tapping near the injection site. Bony sites such as the shoulder or knee are ideal for this technique due to their high density and rigidity that efficiently transmit tactile stimuli––similar to how sound travels faster through solids than through liquids or gases.⁷

To implement this technique in practice, we first stabilize the injection site to reduce movement from tapping. This can be done by stabilizing the injection site (eg, resting the hand on an instrument stand during a nail unit injection). A second person—such as a medical assistant, medical student, resident, or even the patient’s family member—taps at a distant site at least an arm’s length away from the injection site (Figure). The tapping pressure should be firm enough for the patient to feel the vibration but not forceful enough that it becomes unpleasant or disrupts the injection area. Tapping starts just before needle insertion and continues through the injection. No warning is given to the patient, as the surprise element may help distract them from pain. Varying the rhythm, intensity, or location of the tapping can enhance its distracting effect. 

This tapping technique can be effectively combined with other pain reduction strategies in a multimodal approach; for example, when used concurrently with topical anesthetics, both the central (tapping) and peripheral (anesthetic) pain pathways are addressed, potentially yielding additive effects. For patients with a needle ­phobia, pairing tapping with cognitive distraction (eg, talkesthesia) may further reduce anxiety. In our nail specialty clinic at Weill Cornell Medicine (New York, New York), we often combine tapping with cold sprays and talkesthesia, which improves patient comfort without prolonging the visit. Importantly, the technique enables seamless integration with most pharmacologic and nonpharmacologic methods, eliminating the need for additional patient education or procedure time.

Practice Implications

The tapping technique described here is free, easy to implement, and requires no additional resources aside from another person to tap the patient during the procedure. It can be used for a wide range of dermatologic procedures, including biopsies, intralesional injections, and cosmetic treatments, including neurotoxin injections. The minimal learning curve and ease of integration into procedural workflows make this technique a valuable tool for dermatologists aiming to improve patient comfort without disrupting workflow. In our practice, we have observed that tapping reduces self-reported pain and helps ease anxiety, particularly in patients with a needle phobia. Its simplicity and accessibility make it a valuable addition to a wide range of dermatologic procedures. Prospective studies investigating patient-reported outcomes could help establish this technique’s role in clinical practice.

What are the most important things to look at when considering joining a practice after residency?

DR. WORSWICK: When considering a private practice job, I think the most important things to determine might be how much control you will have over your day-to-day work experience (eg, will you be involved in the hiring/ firing of staff, how many rooms will you have in which to see patients, what flexibility exists for your daily schedule), who you will be working with, opportunities for growth and ownership, and the many extraneous things included in your contract (eg, medical insurance, time off, other benefits).

If you are considering joining an academic group, often times many of these things will be out of your control, but you will want to make sure you are finding a program where your teaching or research interests will be supported, that you are choosing a group with people and a mission statement similar to your own, and that you have mentorship available from faculty you want to emulate. There are many fun twists and turns that occur in careers in academic dermatology, so you want to be in a place that will foster your professional interests and allow you to grow and change.

What do academic dermatology programs look for when hiring new junior faculty members?

DR. WORSWICK: I think this depends a lot on time and place. At any given time, a program may need to find a specialist in a particular disease or niche (eg, a mycosis fungoides expert, a pediatric dermatologist, or someone doing hidradenitis suppurativa research). But in general, most academic places are looking to hire people who are excited to care for patients, will work well with the team and support the department’s mission, and enjoy teaching residents and students. For me, much of the fun of being in academics comes from mentorship (as a junior faculty member, this came from being a mentor to residents and students while also being mentored by more senior faculty), teaching, and the ability to care for patients with complicated problems that often require team-based care.

What are some red flags to watch for when considering joining a new practice?

DR. WORSWICK: I think the biggest red flags would be a practice that allows you no control over your schedule and no potential for growth of your compensation. We’ve had many residents choose to work for Kaiser lately, and I think in part that is because Kaiser is very clear regarding what salary, schedule, and expectations are. Fewer and fewer graduating residents are going into solo practice and even dermatologist-owned private practice, but I would encourage residents looking for jobs to consider these models rather than venture capital–funded practices that may not be patient care centered.

How many positions should graduating residents apply for?

DR. WORSWICK: I think this depends a lot on who you are, how specific your preferences are, and what part of the country/world you are looking to practice in. In general, there is a great need for dermatologists, and it shouldn’t be hard to find a job. If you’re in a more saturated urban area, you’re going to want to apply for multiple positions. But if you really know what you want, you may only apply to one practice. I generally advise our residents to consider at least 3 places, if only to compare them to give a better idea of best fit or to ensure that their “top choice” is indeed their top choice.

What are the most important things to look at when considering joining a practice after residency?

DR. WORSWICK: When considering a private practice job, I think the most important things to determine might be how much control you will have over your day-to-day work experience (eg, will you be involved in the hiring/ firing of staff, how many rooms will you have in which to see patients, what flexibility exists for your daily schedule), who you will be working with, opportunities for growth and ownership, and the many extraneous things included in your contract (eg, medical insurance, time off, other benefits).

If you are considering joining an academic group, often times many of these things will be out of your control, but you will want to make sure you are finding a program where your teaching or research interests will be supported, that you are choosing a group with people and a mission statement similar to your own, and that you have mentorship available from faculty you want to emulate. There are many fun twists and turns that occur in careers in academic dermatology, so you want to be in a place that will foster your professional interests and allow you to grow and change.

What do academic dermatology programs look for when hiring new junior faculty members?

DR. WORSWICK: I think this depends a lot on time and place. At any given time, a program may need to find a specialist in a particular disease or niche (eg, a mycosis fungoides expert, a pediatric dermatologist, or someone doing hidradenitis suppurativa research). But in general, most academic places are looking to hire people who are excited to care for patients, will work well with the team and support the department’s mission, and enjoy teaching residents and students. For me, much of the fun of being in academics comes from mentorship (as a junior faculty member, this came from being a mentor to residents and students while also being mentored by more senior faculty), teaching, and the ability to care for patients with complicated problems that often require team-based care.

What are some red flags to watch for when considering joining a new practice?

DR. WORSWICK: I think the biggest red flags would be a practice that allows you no control over your schedule and no potential for growth of your compensation. We’ve had many residents choose to work for Kaiser lately, and I think in part that is because Kaiser is very clear regarding what salary, schedule, and expectations are. Fewer and fewer graduating residents are going into solo practice and even dermatologist-owned private practice, but I would encourage residents looking for jobs to consider these models rather than venture capital–funded practices that may not be patient care centered.

How many positions should graduating residents apply for?

DR. WORSWICK: I think this depends a lot on who you are, how specific your preferences are, and what part of the country/world you are looking to practice in. In general, there is a great need for dermatologists, and it shouldn’t be hard to find a job. If you’re in a more saturated urban area, you’re going to want to apply for multiple positions. But if you really know what you want, you may only apply to one practice. I generally advise our residents to consider at least 3 places, if only to compare them to give a better idea of best fit or to ensure that their “top choice” is indeed their top choice.

What are the most important things to look at when considering joining a practice after residency?

DR. WORSWICK: When considering a private practice job, I think the most important things to determine might be how much control you will have over your day-to-day work experience (eg, will you be involved in the hiring/ firing of staff, how many rooms will you have in which to see patients, what flexibility exists for your daily schedule), who you will be working with, opportunities for growth and ownership, and the many extraneous things included in your contract (eg, medical insurance, time off, other benefits).

If you are considering joining an academic group, often times many of these things will be out of your control, but you will want to make sure you are finding a program where your teaching or research interests will be supported, that you are choosing a group with people and a mission statement similar to your own, and that you have mentorship available from faculty you want to emulate. There are many fun twists and turns that occur in careers in academic dermatology, so you want to be in a place that will foster your professional interests and allow you to grow and change.

What do academic dermatology programs look for when hiring new junior faculty members?

DR. WORSWICK: I think this depends a lot on time and place. At any given time, a program may need to find a specialist in a particular disease or niche (eg, a mycosis fungoides expert, a pediatric dermatologist, or someone doing hidradenitis suppurativa research). But in general, most academic places are looking to hire people who are excited to care for patients, will work well with the team and support the department’s mission, and enjoy teaching residents and students. For me, much of the fun of being in academics comes from mentorship (as a junior faculty member, this came from being a mentor to residents and students while also being mentored by more senior faculty), teaching, and the ability to care for patients with complicated problems that often require team-based care.

What are some red flags to watch for when considering joining a new practice?

DR. WORSWICK: I think the biggest red flags would be a practice that allows you no control over your schedule and no potential for growth of your compensation. We’ve had many residents choose to work for Kaiser lately, and I think in part that is because Kaiser is very clear regarding what salary, schedule, and expectations are. Fewer and fewer graduating residents are going into solo practice and even dermatologist-owned private practice, but I would encourage residents looking for jobs to consider these models rather than venture capital–funded practices that may not be patient care centered.

How many positions should graduating residents apply for?

DR. WORSWICK: I think this depends a lot on who you are, how specific your preferences are, and what part of the country/world you are looking to practice in. In general, there is a great need for dermatologists, and it shouldn’t be hard to find a job. If you’re in a more saturated urban area, you’re going to want to apply for multiple positions. But if you really know what you want, you may only apply to one practice. I generally advise our residents to consider at least 3 places, if only to compare them to give a better idea of best fit or to ensure that their “top choice” is indeed their top choice.

THE DIAGNOSIS: Mpox Virus

The histopathologic features of mpox virus infection may vary depending on the stage of evolution; findings include ballooning degeneration with multinucleated keratinocytes, acanthosis, spongiosis, a neutrophil-rich inflammatory infiltrate, and eosinophilic intracytoplasmic (Guarnieri) inclusion bodies (quiz image inset [arrows]). Prominent neutrophil exocytosis also has been described and may be a characteristic feature in the pustular stage.^1,2 A pattern of interface dermatitis also has been observed on histopathology.³ In our patient, the diagnosis of mpox initially was made by clinical and histopathologic correlation and exclusion of other entities in the differential diagnosis. The diagnosis subsequently was confirmed by real-time polymerase chain reaction. The patient received treatment with tecovirimat, but lesions progressed over the following 6 weeks. He subsequently died due to sepsis and multiorgan failure secondary to AIDS.

Mpox is a zoonotic, double-stranded DNA virus of the genus Orthopoxvirus in the family Poxviridae.⁴ It is transmitted to humans via direct contact with infected animals, most commonly small mammals such as monkeys, squirrels, and rodents. Mpox also may be transmitted between humans through direct contact with bodily fluids, skin and mucosal lesions, respiratory droplets, or fomites. Mpox infection typically begins with a nonspecific flulike prodrome after a 5- to 21-day incubation period, followed by skin lesions of variable morphology affecting any region of the body. Clinically, mpox lesions have been reported to evolve through macular, papular, and vesiculopustular phases, followed by resolution with crusting. Lesions may occur anywhere on the body but frequently manifest on the face then spread centrifugally across the body, with various phases observed simultaneously.⁵ A worldwide outbreak in 2022 involved larger numbers of cases in nonendemic areas, primarily due to skin-to-skin contact, with predominant anal and genital localization of the lesions as well as fewer prodromal symptoms.⁶

The differential diagnosis of crusted and umbilicated papules includes disseminated herpesvirus infection, molluscum contagiosum, disseminated cryptococcosis, and histoplasmosis. Additional causative organisms to consider include Penicillium, Mycobacterium tuberculosis and nontuberculous mycobacteria, as well as Sporothrix schenckii.

Herpesvirus infections may have similar clinical and histopathologic findings to mpox. Histopathologically, herpes simplex virus (HSV) and varicella zoster virus (VZV) are essentially identical; both demonstrate ballooning and reticular epidermal degeneration, chromatin condensation, nuclear degeneration, multinucleated keratinocytes with steel-gray nuclei, and prominent epidermal acantholysis with an inflammatory infiltrate (Figure 1). However, involvement of folliculosebaceous units may favor a diagnosis of VZV. Immunohistochemical staining can further differentiate between HSV and VZV.⁷ While mpox may have features that overlap with both HSV and VZV, including ballooning degeneration and multinucleated keratinocytes with nuclear degeneration, acantholysis is a less commonly reported feature of mpox, and mpox virus infection is characterized by intracytoplasmic (Guarnieri) inclusion bodies rather than the intranuclear inclusion bodies of HSV and VZV.^2,5 The presence of Guarnieri bodies in mpox may further help to distinguish mpox from HSV infection on routine histology.

Molluscum contagiosum infection typically manifests as multiple umbilicated papules at sites of inoculation. Large lesions may be seen in the setting of immunosuppression; however, they usually do not progress to vesicular, pustular, or crusted morphologies. Histopathology demonstrates a cup-shaped invagination of the epidermis into the dermis and proliferative rete ridges that descend downward and encircle the dermis with large eosinophilic intracytoplasmic inclusion (Henderson-Patterson) bodies (Figure 2).⁸

Disseminated cryptococcus infection is caused by the invasive fungus Cryptococcus neoformans and is characterized by meningitis along with fever, malaise, headache, neck stiffness, photophobia, nausea, vomiting, pneumonia with cough and dyspnea, and skin rash, most commonly in immunocompromised individuals.⁹ Skin lesions are a sign of disseminated infection and can manifest as umbilicated or molluscumlike lesions. Histopathology of cryptococcosis demonstrates a granulomatous dermal infiltrate with neutrophils and pleomorphic yeasts measuring 4 µm to 6 µm with refringent capsules.¹⁰ Staining with Grocott methenamine silver and/or mucicarmine for yeast capsules can help to identify organisms (Figure 3).

Cutaneous histoplasmosis is caused by Histoplasma capsulatum, a dimorphic fungus that can lead to pulmonary, cutaneous, and disseminated disease, often in immunocompromised patients.¹¹ Cutaneous disease may manifest with molluscumlike or verrucous papules and plaques. Histopathologic examination reveals diffuse suppurative and granulomatous infiltrates with foamy histiocytes and multinucleated giant cells, containing intracellular and extracellular yeasts measuring 1µm to 5µm, surrounded by a clear halo visible with Grocott methenamine silver stain (Figure 4).

Spreading cutaneous lesions in an immunocompromised individual may be the presentation of multiple infectious etiologies. With the recent rise in mpox cases occurring in nonendemic areas, clinicians should be aware of the spectrum of clinical findings that may occur. Notably, more than one infection may be present in severely immunocompromised individuals, as seen in our patient with chronic orolabial HSV-2 and acute mpox infection. Thorough clinical, histopathologic, and laboratory investigations are necessary for timely diagnosis, appropriate treatment, and exclusion of other life-threatening conditions.

THE DIAGNOSIS: Mpox Virus

The histopathologic features of mpox virus infection may vary depending on the stage of evolution; findings include ballooning degeneration with multinucleated keratinocytes, acanthosis, spongiosis, a neutrophil-rich inflammatory infiltrate, and eosinophilic intracytoplasmic (Guarnieri) inclusion bodies (quiz image inset [arrows]). Prominent neutrophil exocytosis also has been described and may be a characteristic feature in the pustular stage.^1,2 A pattern of interface dermatitis also has been observed on histopathology.³ In our patient, the diagnosis of mpox initially was made by clinical and histopathologic correlation and exclusion of other entities in the differential diagnosis. The diagnosis subsequently was confirmed by real-time polymerase chain reaction. The patient received treatment with tecovirimat, but lesions progressed over the following 6 weeks. He subsequently died due to sepsis and multiorgan failure secondary to AIDS.

Mpox is a zoonotic, double-stranded DNA virus of the genus Orthopoxvirus in the family Poxviridae.⁴ It is transmitted to humans via direct contact with infected animals, most commonly small mammals such as monkeys, squirrels, and rodents. Mpox also may be transmitted between humans through direct contact with bodily fluids, skin and mucosal lesions, respiratory droplets, or fomites. Mpox infection typically begins with a nonspecific flulike prodrome after a 5- to 21-day incubation period, followed by skin lesions of variable morphology affecting any region of the body. Clinically, mpox lesions have been reported to evolve through macular, papular, and vesiculopustular phases, followed by resolution with crusting. Lesions may occur anywhere on the body but frequently manifest on the face then spread centrifugally across the body, with various phases observed simultaneously.⁵ A worldwide outbreak in 2022 involved larger numbers of cases in nonendemic areas, primarily due to skin-to-skin contact, with predominant anal and genital localization of the lesions as well as fewer prodromal symptoms.⁶

The differential diagnosis of crusted and umbilicated papules includes disseminated herpesvirus infection, molluscum contagiosum, disseminated cryptococcosis, and histoplasmosis. Additional causative organisms to consider include Penicillium, Mycobacterium tuberculosis and nontuberculous mycobacteria, as well as Sporothrix schenckii.

Herpesvirus infections may have similar clinical and histopathologic findings to mpox. Histopathologically, herpes simplex virus (HSV) and varicella zoster virus (VZV) are essentially identical; both demonstrate ballooning and reticular epidermal degeneration, chromatin condensation, nuclear degeneration, multinucleated keratinocytes with steel-gray nuclei, and prominent epidermal acantholysis with an inflammatory infiltrate (Figure 1). However, involvement of folliculosebaceous units may favor a diagnosis of VZV. Immunohistochemical staining can further differentiate between HSV and VZV.⁷ While mpox may have features that overlap with both HSV and VZV, including ballooning degeneration and multinucleated keratinocytes with nuclear degeneration, acantholysis is a less commonly reported feature of mpox, and mpox virus infection is characterized by intracytoplasmic (Guarnieri) inclusion bodies rather than the intranuclear inclusion bodies of HSV and VZV.^2,5 The presence of Guarnieri bodies in mpox may further help to distinguish mpox from HSV infection on routine histology.

Molluscum contagiosum infection typically manifests as multiple umbilicated papules at sites of inoculation. Large lesions may be seen in the setting of immunosuppression; however, they usually do not progress to vesicular, pustular, or crusted morphologies. Histopathology demonstrates a cup-shaped invagination of the epidermis into the dermis and proliferative rete ridges that descend downward and encircle the dermis with large eosinophilic intracytoplasmic inclusion (Henderson-Patterson) bodies (Figure 2).⁸

Disseminated cryptococcus infection is caused by the invasive fungus Cryptococcus neoformans and is characterized by meningitis along with fever, malaise, headache, neck stiffness, photophobia, nausea, vomiting, pneumonia with cough and dyspnea, and skin rash, most commonly in immunocompromised individuals.⁹ Skin lesions are a sign of disseminated infection and can manifest as umbilicated or molluscumlike lesions. Histopathology of cryptococcosis demonstrates a granulomatous dermal infiltrate with neutrophils and pleomorphic yeasts measuring 4 µm to 6 µm with refringent capsules.¹⁰ Staining with Grocott methenamine silver and/or mucicarmine for yeast capsules can help to identify organisms (Figure 3).

Cutaneous histoplasmosis is caused by Histoplasma capsulatum, a dimorphic fungus that can lead to pulmonary, cutaneous, and disseminated disease, often in immunocompromised patients.¹¹ Cutaneous disease may manifest with molluscumlike or verrucous papules and plaques. Histopathologic examination reveals diffuse suppurative and granulomatous infiltrates with foamy histiocytes and multinucleated giant cells, containing intracellular and extracellular yeasts measuring 1µm to 5µm, surrounded by a clear halo visible with Grocott methenamine silver stain (Figure 4).

Spreading cutaneous lesions in an immunocompromised individual may be the presentation of multiple infectious etiologies. With the recent rise in mpox cases occurring in nonendemic areas, clinicians should be aware of the spectrum of clinical findings that may occur. Notably, more than one infection may be present in severely immunocompromised individuals, as seen in our patient with chronic orolabial HSV-2 and acute mpox infection. Thorough clinical, histopathologic, and laboratory investigations are necessary for timely diagnosis, appropriate treatment, and exclusion of other life-threatening conditions.

THE DIAGNOSIS: Mpox Virus

The histopathologic features of mpox virus infection may vary depending on the stage of evolution; findings include ballooning degeneration with multinucleated keratinocytes, acanthosis, spongiosis, a neutrophil-rich inflammatory infiltrate, and eosinophilic intracytoplasmic (Guarnieri) inclusion bodies (quiz image inset [arrows]). Prominent neutrophil exocytosis also has been described and may be a characteristic feature in the pustular stage.^1,2 A pattern of interface dermatitis also has been observed on histopathology.³ In our patient, the diagnosis of mpox initially was made by clinical and histopathologic correlation and exclusion of other entities in the differential diagnosis. The diagnosis subsequently was confirmed by real-time polymerase chain reaction. The patient received treatment with tecovirimat, but lesions progressed over the following 6 weeks. He subsequently died due to sepsis and multiorgan failure secondary to AIDS.

Mpox is a zoonotic, double-stranded DNA virus of the genus Orthopoxvirus in the family Poxviridae.⁴ It is transmitted to humans via direct contact with infected animals, most commonly small mammals such as monkeys, squirrels, and rodents. Mpox also may be transmitted between humans through direct contact with bodily fluids, skin and mucosal lesions, respiratory droplets, or fomites. Mpox infection typically begins with a nonspecific flulike prodrome after a 5- to 21-day incubation period, followed by skin lesions of variable morphology affecting any region of the body. Clinically, mpox lesions have been reported to evolve through macular, papular, and vesiculopustular phases, followed by resolution with crusting. Lesions may occur anywhere on the body but frequently manifest on the face then spread centrifugally across the body, with various phases observed simultaneously.⁵ A worldwide outbreak in 2022 involved larger numbers of cases in nonendemic areas, primarily due to skin-to-skin contact, with predominant anal and genital localization of the lesions as well as fewer prodromal symptoms.⁶

The differential diagnosis of crusted and umbilicated papules includes disseminated herpesvirus infection, molluscum contagiosum, disseminated cryptococcosis, and histoplasmosis. Additional causative organisms to consider include Penicillium, Mycobacterium tuberculosis and nontuberculous mycobacteria, as well as Sporothrix schenckii.

Herpesvirus infections may have similar clinical and histopathologic findings to mpox. Histopathologically, herpes simplex virus (HSV) and varicella zoster virus (VZV) are essentially identical; both demonstrate ballooning and reticular epidermal degeneration, chromatin condensation, nuclear degeneration, multinucleated keratinocytes with steel-gray nuclei, and prominent epidermal acantholysis with an inflammatory infiltrate (Figure 1). However, involvement of folliculosebaceous units may favor a diagnosis of VZV. Immunohistochemical staining can further differentiate between HSV and VZV.⁷ While mpox may have features that overlap with both HSV and VZV, including ballooning degeneration and multinucleated keratinocytes with nuclear degeneration, acantholysis is a less commonly reported feature of mpox, and mpox virus infection is characterized by intracytoplasmic (Guarnieri) inclusion bodies rather than the intranuclear inclusion bodies of HSV and VZV.^2,5 The presence of Guarnieri bodies in mpox may further help to distinguish mpox from HSV infection on routine histology.

Molluscum contagiosum infection typically manifests as multiple umbilicated papules at sites of inoculation. Large lesions may be seen in the setting of immunosuppression; however, they usually do not progress to vesicular, pustular, or crusted morphologies. Histopathology demonstrates a cup-shaped invagination of the epidermis into the dermis and proliferative rete ridges that descend downward and encircle the dermis with large eosinophilic intracytoplasmic inclusion (Henderson-Patterson) bodies (Figure 2).⁸

Disseminated cryptococcus infection is caused by the invasive fungus Cryptococcus neoformans and is characterized by meningitis along with fever, malaise, headache, neck stiffness, photophobia, nausea, vomiting, pneumonia with cough and dyspnea, and skin rash, most commonly in immunocompromised individuals.⁹ Skin lesions are a sign of disseminated infection and can manifest as umbilicated or molluscumlike lesions. Histopathology of cryptococcosis demonstrates a granulomatous dermal infiltrate with neutrophils and pleomorphic yeasts measuring 4 µm to 6 µm with refringent capsules.¹⁰ Staining with Grocott methenamine silver and/or mucicarmine for yeast capsules can help to identify organisms (Figure 3).

Cutaneous histoplasmosis is caused by Histoplasma capsulatum, a dimorphic fungus that can lead to pulmonary, cutaneous, and disseminated disease, often in immunocompromised patients.¹¹ Cutaneous disease may manifest with molluscumlike or verrucous papules and plaques. Histopathologic examination reveals diffuse suppurative and granulomatous infiltrates with foamy histiocytes and multinucleated giant cells, containing intracellular and extracellular yeasts measuring 1µm to 5µm, surrounded by a clear halo visible with Grocott methenamine silver stain (Figure 4).

Spreading cutaneous lesions in an immunocompromised individual may be the presentation of multiple infectious etiologies. With the recent rise in mpox cases occurring in nonendemic areas, clinicians should be aware of the spectrum of clinical findings that may occur. Notably, more than one infection may be present in severely immunocompromised individuals, as seen in our patient with chronic orolabial HSV-2 and acute mpox infection. Thorough clinical, histopathologic, and laboratory investigations are necessary for timely diagnosis, appropriate treatment, and exclusion of other life-threatening conditions.

To the Editor:

The popularity of the social media platform TikTok, which is known for its short-form videos, has surged in recent years. Viral videos demonstrating skin care routines reach millions of viewers,¹ showcasing specific products, detailing beauty regimens, and setting fads that many users eagerly follow. These trends often influence consumer behavior—in 2023, viral videos using the tag #TikTokMadeMeBuy lead to a 14% growth in the sale of skin care products.² However, they also encourage purchasing decisions that may escalate environmental waste through plastic packaging and single-use products. In this study, we analyzed videos on TikTok to assess the environmental impact of trending skin care routines. By examining the types of products promoted, their packaging, and the frequency with which they appear in viral content, we aimed to investigate how these trends, which may be imitated by users, impact the environment.

A search of TikTok videos using #skincareroutine was conducted on June 21, 2024. Sponsored content, non–English language videos, videos without demonstrated skin care routines, and videos showing makeup routines were excluded from our analysis. Data collected from each video included username, date posted, number of likes, total number of skin care products used, number of single-use skin care products used, average amount of product used, number of skin care applicators used, and number of single-use applicators used. Single-use items, defined as those intended for one-time use and subsequent disposal, were identified visually by packaging, manufacturer intent, and common consumer usage patterns. The amount of product used per application was graded on a scale of 1 to 3 (1=pea-sized amount or less; 2=single full pump/spray; 3=multiple pumps/sprays). Videos were categorized as personal (ie, skin care routine walk-throughs by the creator) or autonomous sensory meridian response (ASMR)(focused on product sounds and aesthetics).³ A Mann-Whitney U test was utilized to statistically compare the 2 groups. Statistical analysis was performed using Microsoft Excel (α=0.05). 

A total of 50 videos met the inclusion criteria and were included in the analysis. The average number of likes per video was 499,696.15, with skin care routines featuring an average of 6.4 unique products (Table). There was a weak positive correlation (r=0.1809) between the number of skin care products used and the number of likes. A total of 320 products were used across the videos, 23 of which were single-use (7.2%).On average, single-use skin care items were used 0.46 times per routine, comprising a mean 7.99% of total products per video. The average score for the amount of product used per application was 2.18. There was no difference in personal vs ASMR videos with regard to the total number of skin care products used or the average amount of product used per application (P>.05). Thirty-three (70.2%) of the 47 applicators used across all videos were single-use. An average of 0.94 applicators per routine were utilized, with a mean 68.83% being single-use applicators. Common single-use products were toner wipes and eye patches, and single-use applicators included cotton pads and plastic spatulas. 

Our findings indicated a prevalence of multiple products and large amount of product used in trending skin care routines, suggesting a shift toward multistep skin care. This implies a high rate of product consumption that may accelerate the carbon footprint associated with skin care products,³ which could contribute to climate change and environmental degradation. Consumers also may feel compelled to purchase and discard numerous partially used products in order to keep up with the latest trends, exacerbating the environmental impact. Furthermore, the utilization of single-use products and applicators contributes to increased plastic waste, pollution, and resource depletion. Single-use items often are difficult to recycle due to their mixed materials and small size,^4,5 and therefore they can accumulate in landfills and oceans. This impact can be mitigated by switching to reusable applicators, refillable packaging, and biodegradable materials. 

The substantial average number of likes per video indicates high engagement with skin care content among TikTok users. The continued popularity of complex multi­step skin care routines, despite a weak correlation between the number of skin care products used and the number of likes per video, likely stems from factors such as aesthetic appeal, ASMR effects, and creators’ established followings, which may drive user engagement to contribute to unsustainable consumption patterns. Factors such as presentation style, aesthetics, or creators’ pre-existing online following may have a major impact on how well a video performs on TikTok. The similarity between personal and ASMR videos, particularly in the number of products used and the amount applied, suggests that both formats employ common approaches to meet audience expectations and align with promotional trends, relying more on sensory and aesthetic strategies than substantive differences in skin care routines.

Our use of only one tag in our search as well as the subjective quantity scale limits the generalizability of these findings to broader TikTok skin care content.

Overall, our study underscores the role of brands and social media influencers in skin care education and promotion of sustainable practices. The extensive number of products used and generous application of each product in skin care routines demonstrated in TikTok videos may mislead viewers into believing that using more product improves outcomes, when often, less is more. We recommend that dermatologists counsel patients about informed skin care regimens that prioritize individual needs over social media fads.

To the Editor:

The popularity of the social media platform TikTok, which is known for its short-form videos, has surged in recent years. Viral videos demonstrating skin care routines reach millions of viewers,¹ showcasing specific products, detailing beauty regimens, and setting fads that many users eagerly follow. These trends often influence consumer behavior—in 2023, viral videos using the tag #TikTokMadeMeBuy lead to a 14% growth in the sale of skin care products.² However, they also encourage purchasing decisions that may escalate environmental waste through plastic packaging and single-use products. In this study, we analyzed videos on TikTok to assess the environmental impact of trending skin care routines. By examining the types of products promoted, their packaging, and the frequency with which they appear in viral content, we aimed to investigate how these trends, which may be imitated by users, impact the environment.

A search of TikTok videos using #skincareroutine was conducted on June 21, 2024. Sponsored content, non–English language videos, videos without demonstrated skin care routines, and videos showing makeup routines were excluded from our analysis. Data collected from each video included username, date posted, number of likes, total number of skin care products used, number of single-use skin care products used, average amount of product used, number of skin care applicators used, and number of single-use applicators used. Single-use items, defined as those intended for one-time use and subsequent disposal, were identified visually by packaging, manufacturer intent, and common consumer usage patterns. The amount of product used per application was graded on a scale of 1 to 3 (1=pea-sized amount or less; 2=single full pump/spray; 3=multiple pumps/sprays). Videos were categorized as personal (ie, skin care routine walk-throughs by the creator) or autonomous sensory meridian response (ASMR)(focused on product sounds and aesthetics).³ A Mann-Whitney U test was utilized to statistically compare the 2 groups. Statistical analysis was performed using Microsoft Excel (α=0.05). 

A total of 50 videos met the inclusion criteria and were included in the analysis. The average number of likes per video was 499,696.15, with skin care routines featuring an average of 6.4 unique products (Table). There was a weak positive correlation (r=0.1809) between the number of skin care products used and the number of likes. A total of 320 products were used across the videos, 23 of which were single-use (7.2%).On average, single-use skin care items were used 0.46 times per routine, comprising a mean 7.99% of total products per video. The average score for the amount of product used per application was 2.18. There was no difference in personal vs ASMR videos with regard to the total number of skin care products used or the average amount of product used per application (P>.05). Thirty-three (70.2%) of the 47 applicators used across all videos were single-use. An average of 0.94 applicators per routine were utilized, with a mean 68.83% being single-use applicators. Common single-use products were toner wipes and eye patches, and single-use applicators included cotton pads and plastic spatulas. 

Our findings indicated a prevalence of multiple products and large amount of product used in trending skin care routines, suggesting a shift toward multistep skin care. This implies a high rate of product consumption that may accelerate the carbon footprint associated with skin care products,³ which could contribute to climate change and environmental degradation. Consumers also may feel compelled to purchase and discard numerous partially used products in order to keep up with the latest trends, exacerbating the environmental impact. Furthermore, the utilization of single-use products and applicators contributes to increased plastic waste, pollution, and resource depletion. Single-use items often are difficult to recycle due to their mixed materials and small size,^4,5 and therefore they can accumulate in landfills and oceans. This impact can be mitigated by switching to reusable applicators, refillable packaging, and biodegradable materials. 

The substantial average number of likes per video indicates high engagement with skin care content among TikTok users. The continued popularity of complex multi­step skin care routines, despite a weak correlation between the number of skin care products used and the number of likes per video, likely stems from factors such as aesthetic appeal, ASMR effects, and creators’ established followings, which may drive user engagement to contribute to unsustainable consumption patterns. Factors such as presentation style, aesthetics, or creators’ pre-existing online following may have a major impact on how well a video performs on TikTok. The similarity between personal and ASMR videos, particularly in the number of products used and the amount applied, suggests that both formats employ common approaches to meet audience expectations and align with promotional trends, relying more on sensory and aesthetic strategies than substantive differences in skin care routines.

Our use of only one tag in our search as well as the subjective quantity scale limits the generalizability of these findings to broader TikTok skin care content.

Overall, our study underscores the role of brands and social media influencers in skin care education and promotion of sustainable practices. The extensive number of products used and generous application of each product in skin care routines demonstrated in TikTok videos may mislead viewers into believing that using more product improves outcomes, when often, less is more. We recommend that dermatologists counsel patients about informed skin care regimens that prioritize individual needs over social media fads.

To the Editor:

The popularity of the social media platform TikTok, which is known for its short-form videos, has surged in recent years. Viral videos demonstrating skin care routines reach millions of viewers,¹ showcasing specific products, detailing beauty regimens, and setting fads that many users eagerly follow. These trends often influence consumer behavior—in 2023, viral videos using the tag #TikTokMadeMeBuy lead to a 14% growth in the sale of skin care products.² However, they also encourage purchasing decisions that may escalate environmental waste through plastic packaging and single-use products. In this study, we analyzed videos on TikTok to assess the environmental impact of trending skin care routines. By examining the types of products promoted, their packaging, and the frequency with which they appear in viral content, we aimed to investigate how these trends, which may be imitated by users, impact the environment.

A search of TikTok videos using #skincareroutine was conducted on June 21, 2024. Sponsored content, non–English language videos, videos without demonstrated skin care routines, and videos showing makeup routines were excluded from our analysis. Data collected from each video included username, date posted, number of likes, total number of skin care products used, number of single-use skin care products used, average amount of product used, number of skin care applicators used, and number of single-use applicators used. Single-use items, defined as those intended for one-time use and subsequent disposal, were identified visually by packaging, manufacturer intent, and common consumer usage patterns. The amount of product used per application was graded on a scale of 1 to 3 (1=pea-sized amount or less; 2=single full pump/spray; 3=multiple pumps/sprays). Videos were categorized as personal (ie, skin care routine walk-throughs by the creator) or autonomous sensory meridian response (ASMR)(focused on product sounds and aesthetics).³ A Mann-Whitney U test was utilized to statistically compare the 2 groups. Statistical analysis was performed using Microsoft Excel (α=0.05). 

A total of 50 videos met the inclusion criteria and were included in the analysis. The average number of likes per video was 499,696.15, with skin care routines featuring an average of 6.4 unique products (Table). There was a weak positive correlation (r=0.1809) between the number of skin care products used and the number of likes. A total of 320 products were used across the videos, 23 of which were single-use (7.2%).On average, single-use skin care items were used 0.46 times per routine, comprising a mean 7.99% of total products per video. The average score for the amount of product used per application was 2.18. There was no difference in personal vs ASMR videos with regard to the total number of skin care products used or the average amount of product used per application (P>.05). Thirty-three (70.2%) of the 47 applicators used across all videos were single-use. An average of 0.94 applicators per routine were utilized, with a mean 68.83% being single-use applicators. Common single-use products were toner wipes and eye patches, and single-use applicators included cotton pads and plastic spatulas. 

Our findings indicated a prevalence of multiple products and large amount of product used in trending skin care routines, suggesting a shift toward multistep skin care. This implies a high rate of product consumption that may accelerate the carbon footprint associated with skin care products,³ which could contribute to climate change and environmental degradation. Consumers also may feel compelled to purchase and discard numerous partially used products in order to keep up with the latest trends, exacerbating the environmental impact. Furthermore, the utilization of single-use products and applicators contributes to increased plastic waste, pollution, and resource depletion. Single-use items often are difficult to recycle due to their mixed materials and small size,^4,5 and therefore they can accumulate in landfills and oceans. This impact can be mitigated by switching to reusable applicators, refillable packaging, and biodegradable materials. 

The substantial average number of likes per video indicates high engagement with skin care content among TikTok users. The continued popularity of complex multi­step skin care routines, despite a weak correlation between the number of skin care products used and the number of likes per video, likely stems from factors such as aesthetic appeal, ASMR effects, and creators’ established followings, which may drive user engagement to contribute to unsustainable consumption patterns. Factors such as presentation style, aesthetics, or creators’ pre-existing online following may have a major impact on how well a video performs on TikTok. The similarity between personal and ASMR videos, particularly in the number of products used and the amount applied, suggests that both formats employ common approaches to meet audience expectations and align with promotional trends, relying more on sensory and aesthetic strategies than substantive differences in skin care routines.

Our use of only one tag in our search as well as the subjective quantity scale limits the generalizability of these findings to broader TikTok skin care content.

Overall, our study underscores the role of brands and social media influencers in skin care education and promotion of sustainable practices. The extensive number of products used and generous application of each product in skin care routines demonstrated in TikTok videos may mislead viewers into believing that using more product improves outcomes, when often, less is more. We recommend that dermatologists counsel patients about informed skin care regimens that prioritize individual needs over social media fads.