Urticaria has many causes, allergy is its common cause, 3-year-old child urticaria can be treated with general treatment, cetirizine and other drugs. 1. General treatment: the main thing is to cut the nails to prevent secondary skin infections caused by scratching; at the same time for repeated urticaria try to detect allergens, find allergens after targeted avoidance, in order to prevent re-emergence. 2. medication: you can use zinc oxide, glycerite and other topical drugs to astringent itching; at the same time oral cetirizine, loratadine syrup and other anti-allergy drugs. If the child’s itching is obvious or accompanied by limb edema, etc., need oral prednisone and other glucocorticoid therapy. There may be other treatments for hives in 3 year old children, it is recommended to consult a doctor in time, after a clear diagnosis for targeted treatment.