What should you know about sun allergy protection?

Polymorphic light eruption and other forms of sun sensitivity can appear after ultraviolet exposure, with itchy bumps, red patches, or blisters on exposed skin. Reactions may be more noticeable after a period with little sun. The eruption is not diagnosed from location alone, so a dermatologist may ask about medicines, cosmetics, timing, and whether covered areas are affected. See [Sun Sensitivity](/symptoms/sun-sensitivity/) for a broader overview.

Seek shade when sunlight is strongest, wear long sleeves or trousers made from a close-weave fabric, and use a hat and sunglasses. Apply a broad-spectrum sunscreen to exposed skin according to its directions, and reapply after sweating or swimming. Remember overlooked areas such as the ears, neck, hands, and tops of the feet. Introduce new products cautiously if your skin is reactive. For frequent seasonal flares, a clinician may discuss [Narrowband UVB Phototherapy](/treatments/medical-dermatology/narrowband-uvb-phototherapy/).

Arrange a review if careful protection does not control the rash, if it appears under clothing, or if it leaves marked colour change or scarring. Seek urgent care for breathing trouble, facial or tongue swelling, faintness, severe pain, or signs of infection such as increasing warmth and pus. Do not stop a prescribed medicine without advice, even if you suspect it increases light sensitivity.

Ask which wavelengths or exposures may be triggering your reaction, whether any current medicine increases sensitivity, and how to protect skin during work or travel. Ask when a short course of [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/) is appropriate.