Abstract
The prevalence of personal care product (PCP)-related dermatoses has increased over the last 20 years. The frequency of PCP-related allergen positive patch tests more than doubled between 1996 and 2016.1 Notably, many dermatologist-recommended shampoos, including prescription-strength and over-the-counter antidandruff shampoos and tar shampoos, contain formaldehyde releasers and other known allergens. PCP allergy has also been associated with lichen planopilaris and frontal fibrosing alopecia. In a study of 42 patients with lichen planopilaris/fibrosing alopecia, 76.2% had positive reactions to allergens in their PCPs used on the face and scalp, and allergen avoidance resulted in decreased scalp inflammation.
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