Sun Allergy and Solar Urticaria: What Relief Involves

Solar urticaria is a light-triggered form of hives. Raised, itchy welts can develop on uncovered skin soon after exposure and may fade when the trigger is removed. The reaction can affect areas reached by sunlight even when nearby skin is covered. It is different from polymorphic light eruption, which often develops later and may look like bumps or patches. A clinician may compare your timing, photographs, medicines, and products with the symptoms. See [Sun Sensitivity](/symptoms/sun-sensitivity/) for broader information about light-related skin reactions.

Go indoors or into deep shade, cover exposed skin, and cool uncomfortable areas with a clean cool compress. Do not deliberately test the rash with more sunlight. A pharmacist or clinician can advise whether an antihistamine is suitable for you. If episodes keep returning, a dermatologist may discuss light testing, medication review, or preventive treatment. Options can include [Topical Corticosteroids](/treatments/medical-dermatology/topical-corticosteroids/) for selected inflammation, while supervised [Narrowband UVB Phototherapy](/treatments/medical-dermatology/narrowband-uvb-phototherapy/) may be considered in a carefully planned programme.

Get urgent help if hives are accompanied by swelling of the lips, tongue, or throat, wheezing, difficulty breathing, dizziness, or collapse. Arrange a dermatology appointment for repeated episodes, symptoms on covered skin, or a rash that lasts after leaving the light. Do not assume every sun-related hive is solar urticaria; infections, medicines, and other allergic reactions can look similar.

How quickly after light exposure do my symptoms fit solar urticaria? Do I need supervised light testing? Could a medicine or product be increasing sensitivity? What should I carry or use if hives recur?