What are the treatment options for sun allergy?

Polymorphic light eruption is an itchy rash that appears after exposure to sunlight or another source of ultraviolet light. The rash can contain small bumps, patches, or blisters, and its appearance may vary between people. It often affects areas that are newly exposed after a period with less sunlight. The timing and distribution help a clinician distinguish it from heat rash, contact dermatitis, infection, or a medicine-related reaction.

Cover exposed skin with tightly woven clothing, seek shade, and use a broad-spectrum sunscreen that your skin tolerates. During an inflamed flare, [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/) may be prescribed for a limited course and specific areas. For recurrent seasonal symptoms, [Narrowband UVB Phototherapy](/treatments/medical-dermatology/narrowband-uvb-phototherapy/) can gradually condition the skin under supervised medical care. Start exposure plans only with professional guidance, because too much ultraviolet light can trigger a flare or cause burns.

Seek medical advice if the rash is widespread, severe, blistered, infected-looking, or accompanied by swelling of the lips, tongue, or face, breathing difficulty, faintness, or eye involvement. Arrange assessment when episodes follow a new medicine or occur without clear light exposure. A clinician can review triggers and confirm whether another light-sensitive condition is present.

Could this rash be polymorphic light eruption or another photosensitive condition? Which sunscreen and protective clothing are suitable? How should I use a steroid cream during a flare? Would preventive phototherapy be appropriate before my usual sunny season?