Skin allergies from sun exposure

The reaction may develop hours after sunlight and can include red patches, tiny bumps, or blisters. It often affects the backs of the hands, forearms, upper chest, or face, while areas protected by clothing remain clearer. Sun allergy is a useful everyday term rather than one single diagnosis. Polymorphic light eruption is one possibility; photoallergic reactions to medicines or skin products are others. A clinician may review your exposure, recent products, medicines, and whether symptoms recur in a predictable season. A photo of the rash taken when it is active can make that history more useful.

Stop sun exposure, cover the rash with tightly woven clothing, and seek shade. Use a gentle cleanser and fragrance-free moisturiser, and avoid picking or applying new cosmetic products to the area. Sunscreen can reduce ultraviolet exposure when used correctly, but it does not make prolonged exposure suitable during a flare. For inflammation, a doctor may prescribe topical corticosteroids for a defined area and duration. If predictable episodes interfere with daily life, a dermatologist may discuss narrowband UVB phototherapy as a supervised preventive option.

Get emergency help if facial or throat swelling affects breathing, swallowing, or alertness. Seek same-day advice for blistering over a large area, severe pain, pus, fever, eye involvement, or a rapidly spreading rash. Arrange a routine review for repeated reactions, symptoms after starting a medicine, or a rash that persists despite avoiding sunlight.

Ask which diagnosis best fits the timing and distribution, whether any medicine or product increases light sensitivity, and how to protect your skin at work or outdoors. Ask how long to use any prescribed cream and what changes should prompt review.