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Though there have been significant shifts in US demographic data over the past 50 years, research cohorts lack full racial and ethnic representation. There is little data available regarding the diversity of dermatology research cohorts with respect to sex, race, and ethnicity.

To characterize and assess the representation of racial and ethnic minorities and women in randomized controlled trials across a range of dermatologic conditions.

All randomized clinical trials (RCTs) were identified between July 2010 and July 2015 within the PubMed database using the following keywords: “psoriasis,” “atopic dermatitis,” “acne,” “vitiligo,” “seborrheic dermatitis,” “alopecia areata,” and “lichen planus.” Diverse study populations were defined as including a greater than 20% racial or ethnic minority participants based on US census data. The distributions of sex and race groups in studies were …