To the Editor:
We read with great interest the article by Chu et al1 (Cutis. 2021;107:157-159) and commend them for noting the underrepresentation of skin of color (SOC) in the American Academy of Dermatology (AAD) Basic Dermatology Curriculum. The AAD Basic Dermatology Curriculum represents one introductory resource that is ubiquitously utilized by medical students. Herein, we add an analysis of the representation of SOC in the following resources that also comprise the first exposure medical students have to dermatology: Dermatology Clinics Clinical Advisor articles (https://www.clinicaladvisor.com/home/dermatology/dermatology-clinics/), Learn Derm Module (LDM) by VisualDx (https://www.visualdx.com/learnderm/), Lookingbill and Marks’ Principles of Dermatology (6th ed)(LB&M),2 and DermNet NZ (https://dermnetnz.org/). We performed a focused search of the DermNet NZ database for images of the following common dermatologic conditions: acne, rosacea, alopecia, urticaria, arthropod bites, blistering diseases (bullous pemphigoid and pemphigus vulgaris), connective tissue diseases (dermatomyositis and lupus), inflammatory conditions (atopic dermatitis, contact dermatitis, and psoriasis), keloids, benign and malignant neoplasms (nevi, seborrheic keratosis, actinic keratosis, basal and squamous cell carcinomas, and melanoma including acral melanoma), bacterial skin infections (impetigo, erysipelas, cellulitis, staphylococcal scalded skin syndrome, and syphilis), fungal infections (dermatophyte infections), and viral skin infections (herpes, molluscum contagiosum, varicella-zoster virus, and warts). We classified images as light (Fitzpatrick phototypes I–IV) or dark (Fitzpatrick phototypes V or VI). We excluded images without visible background skin (eg, images of oral mucosa, genitalia, nails, palms and soles, dermoscopic images, histopathologic images).
We found the representation of SOC in the resources we selected to be as follows: Dermatology Clinics Clinical Advisor articles (70/367 or 19%); LDM (26/150 or 17%); LB&M (52/374 or 14%); DermNet NZ (11/310 or 4%). Representation of SOC in common dermatologic conditions such as actinic keratosis, alopecia, rosacea, urticaria, and warts was entirely absent across all resources. Other common skin diseases were represented in only one of the resources we analyzed: acne (represented only in LB&M, where only 3/11 images of acne were depicted in SOC); contact dermatitis (represented only in LB&M, where only 1/6 images of contact dermatitis were depicted in SOC); psoriasis (represented only on DermNet NZ, where only 2/25 images of psoriasis were depicted in SOC); seborrheic keratosis (represented only in LB&M, where 1/2 images of seborrheic keratosis were depicted in SOC). Furthermore, none of the resources we analyzed depicted malignancy (basal cell carcinoma, squamous cell carcinoma, and melanoma) in SOC. Although the poor representation of SOC in malignancies can be explained by the predilection of skin cancer for light skin, other dermatologic conditions that are more common in SOC also were poorly represented in these resources in SOC: acral melanoma, not represented in any of the resources we analyzed; subacute cutaneous lupus erythematosus and systemic lupus erythematosus, also not represented in any of the resources we analyzed; keloids, represented only in LB&M.
Although no study has investigated the true prevalence of Fitzpatrick phototypes in the United States, He et al3 demonstrated the prevalence of Fitzpatrick phototypes V and VI to be 25.0% and 18.8%, respectively, in an ethnically diverse study of 3386 participants. Indeed, the representation of SOC in the resources we analyzed falls short of this plausible estimate of SOC in an increasingly diverse US population.
Our work adds to the growing body of literature exposing the deficiencies in SOC representation in dermatology. As Lester et al4 noted, such poor representation of SOC is deleterious not just to patients, who may be misdiagnosed, but also more generally to the integrity of the field of dermatology. Moreover, our study, which analyzes introductory resources referenced by the junior medical student, highlights a potential danger of poor SOC representation for trainees—limited exposure to SOC may leave medical students unprepared to recognize lesions in SOC during clerkships and residency. Furthermore, we note an additional concern with minimal SOC representation in online modules such as the AAD and LDM module as well as online databases such as DermNet NZ; images from these resources may be used as training sets for machine learning (ML) software (indeed, DermNet NZ has been used as a training set for ML programs5). However, if data sets with poor representation of SOC are used to train ML algorithms, then ML software may be unable to recognize lesions in SOC.6 Thus, inadequate representation of SOC in online modules and databases may exacerbate existing inequities in dermatology.
To address the paucity of SOC representation, students can be directed to resources devoted to depicting SOC; however, as discussed eloquently by Chu et al,1 an attempt to update existing resources also must be made. The senior author in our study (S.J.K.) embraced such an approach, updating the dermatology lectures given to medical students to include more images of SOC. Such a top-down approach may represent a major step in dismantling the systemic biases that pervade dermatology.
A limitation of our analysis was use of the Fitzpatrick scale, which was conceived as a phenotypic scale to assess cutaneous responses to UV irradiation.7 Although it is the most commonly used scale to describe race/ethnicity and/or constitute skin color, it is not possible to include all non-White skin types and classify strictly under this umbrella term.
References
1. Chu B, Fathy R, Onyekaba G, et al. Distribution of skin-type diversity in photographs in AAD online educational modules. Cutis. 2021;107:157-159. doi:10.12788/cutis.0196
2. Marks JG Jr, Miller JJ. Lookingbill and Marks’ Principles of Dermatology. 6th ed. Saunders Elsevier; 2018.
3. He SY, McCulloch CE, Boscardin WJ, et al. Self-reported pigmentary phenotypes and race are significant but incomplete predictors of Fitzpatrick skin phototype in an ethnically diverse population. J Am Acad Dermatol. 2014;71:731-737. doi:10.1016/j.jaad.2014.05.023
4. Lester JC, Taylor SC, Chren M-M. Under‐representation of skin of colour in dermatology images: not just an educational issue. Br J Dermatol. 2019;180:1521-1522. doi:10.1111/bjd.17608
5. Aggarwal P. Data augmentation in dermatology image recognition using machine learning. Skin Res Technol. 2019;25:815-820. doi:10.1111/srt.12726
6. Adamson AS, Smith A. Machine learning and health care disparities in dermatology. JAMA Dermatol. 2018;154:1247-1248. doi:10.1001/jamadermatol.2018.2348
7. Ware OR, Dawson JE, Shinohara MM, et al. Racial limitations of Fitzpatrick skin type. Cutis. 2020;105:77-80.