Acute urticaria can subside after 3 to 5 days of oral antihistamines, and can be cured in 2 to 3 days of intensive treatment. Chronic urticaria is often more than 6 weeks old. Acute urticaria, if the regular antihistamine (such as loratadine, cetirizine, etc.) treatment, as well as glucocorticoid ointment (such as compound dexamethasone acetate cream, etc.) topical application, in about 3 to 5 days can significantly control the urticaria attack, usually in 7 to 10 days to control the disease, and no further attacks. Chronic urticaria is defined as hives that last longer than 6 weeks. Attacks vary from several times a day to once every few days, and treatment is more difficult and prolonged. Only by identifying the cause of the disease can future recurrences be avoided, and desensitization or prophylactic medication can be given for certain unavoidable allergens.