Sun allergy is a common medical problem. To diagnose sun allergy, a doctor performs several tests such as UV light testing, photopatch testing, blood and sample tests.
Sun allergy or photosensitivity is an allergic reaction, which develops usually on the skin when exposed to ultraviolet rays of the sun. The severity of reaction may vary from mild to severe. Patients, who develop severe reactions from sunlight, need medical attention, however, most mild cases may be managed with self-treatment or avoidance of exposure to sunlight. Many other conditions, however, may cause symptoms similar to sun allergy. Hence, your doctor would like to ensure that your skin reaction isn't due to something other than a sun allergy. To diagnose the cause of your symptoms, the doctor will take a detailed history, examine you and if needed, do tests.
History and examination: Some questions that the doctor may ask are:
Discuss with your doctor all your medications. Some medicines that often cause phototoxic or photoallergic reaction on sunlight exposure includes thiazide diuretics, tetracycline antibiotics, NSAIDs (painkillers), etc. Your doctor may suggest medicines that are likely to cause this reaction.
Tests to diagnose sun allergy: Some tests that may be done to check skin reactions to sun exposure include:
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