The manifestations of skin UV allergy will first appear on exposed areas such as the face, neck and extremities, and in severe cases may also involve non-exposed areas such as the trunk. After this allergy occurs. First, pay attention to avoiding light and minimize outdoor activities, especially between 10:00 a.m. and 14:00 p.m., the time when UV rays are strongest, try not to go out. Second, apply sunscreen with uvb and uva protection before going out daily. For the treatment of UV allergy, oral loratadine and hydroxychloroquine can be taken to anti-inflammatory and relieve itching. For more severe symptoms, oral glucocorticoids can be given at the same time, or intramuscular injection of compound betamethasone injection. In the early stage when redness and swelling are obvious, topical application of glyburide lotion can be used several times a day; in the subacute and chronic stages, topical application of moderately weak corticosteroid creams, such as dinaide cream, hydrocortisone butyrate ointment, and mometasone furoate cream can be used, but be careful not to use them for a long time. Corticosteroids and calcium phosphatase inhibitors can also be used alternately to avoid the adverse effects of hormones.