Skin allergy after sun exposure

A reaction after sun may be caused by sensitivity to ultraviolet light, a product activated by light, or a separate rash that happens to appear at the same time. Polymorphic light eruption can cause itchy red spots, raised plaques, or small blisters after exposure, often on the forearms, neckline, or lower legs. Sunburn is more likely to feel hot and tender across the exposed area. These patterns overlap, so the timing of onset, shape of the rash, and any new medicines or fragrances are useful details for a clinician.

Go indoors or into shade and cover the affected skin. Cool compresses may ease heat and itch; use a plain moisturiser once the skin is comfortable. Avoid fragranced products, exfoliation, and intentional re-exposure while the rash is active. A doctor may suggest a topical corticosteroid for short-term inflammation control. When flares are recurrent, supervised narrowband UVB phototherapy may be considered before a high-exposure season, with treatment selected for your skin and diagnosis.

Call emergency services for breathing difficulty, throat or tongue swelling, collapse, or widespread swelling with feeling faint. Seek prompt review for painful blisters, yellow crusting, fever, eye symptoms, or rapid spread. A dermatology appointment is sensible when each episode lasts longer than expected, returns frequently, follows a new prescription, or appears despite covering the skin.

Ask whether you should stop or change any medicine or skincare product, how to select protective clothing and sunscreen, and whether a prescribed cream is safe for the affected location. Ask whether recurrent episodes warrant specialist testing or preventive treatment.