Experts detailed how certain substances can trigger photocontact dermatitis in skin exposed to the sun, according to a press release from the AAD. The research was presented by Adler et al at the 2024 AAD Annual Meeting. Photocontact dermatitis is often accompanied by symptoms such as itching; redness; blistering; burning; skin darkening; or severe sunburns on the face, neck, and limbs.

Recent studies have shown that patients with darker skin tones may be more likely to develop two other types of photosensitivity: polymorphous light eruption and chronic actinic dermatitis. The experts recommended that individuals pay attention to whether they experience symptoms of photocontact dermatitis after handling fruits and vegetables like limes, figs, and celery; coming into contact with plants like hogweed and St. John’s wort; and taking topical or oral drugs like hydrochlorothiazide.

They noted that although topical treatments that trigger a photosensitive reaction may only cause skin-related symptoms at the site of the drug’s application, those that are taken orally may lead to symptoms across any part of the skin exposed to the sun. Anti-inflammatory drugs may help relieve symptoms but identifying and avoiding triggers may be critical to mitigating future flare-ups of photocontact dermatitis.

Patients with the condition should also seek shade when possible; wear sun-protective clothing; and apply a broad-spectrum, water-resistant sunscreen with an SPF of 30 or higher when spending time outdoors. “If [individuals] notice a rash or blister on [their] bodies after being in the sun, it’s important to see a board-certified dermatologist who can determine whether [they] have a sun-related skin disorder, determine what is causing [their] sun sensitivity, and provide a treatment option that works best for [their] condition,” concluded lead study author Brandon L. Adler, MD, Assistant Professor of Dermatology at the Keck School of Medicine at the University of Southern California.