When are topical corticosteroids recommended for photodermatitis?

Photodermatitis is an inflammatory reaction in skin affected by light, sometimes after contact with a substance or use of a medicine that changes light sensitivity. It can cause redness, itching, bumps, blisters, burning or later darkening. A topical corticosteroid can settle inflammation during an active episode, but it does not identify the trigger or protect skin from further light exposure.

Reduce light exposure to the affected skin with clothing, shade and the protection plan recommended for you. Review new medicines, fragrances, plants, cosmetics and sunscreens with a clinician, because the relevant trigger may be external or medication-related. Apply the prescribed treatment only as instructed, especially on the face or other thin skin, and moisturise if dryness remains. Do not restart a suspected trigger simply to test it. See [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/) for general treatment information.

Seek review if the rash recurs after small amounts of light, spreads beyond exposed areas, blisters extensively, leaves significant colour change or does not improve after the trigger plan begins. Get urgent help for swelling of the lips or face, breathing trouble, fever or severe skin pain.

Ask whether a medicine or product could be contributing, how much light protection is needed, whether testing is appropriate, and how to use the cream safely on the affected site.