Chronic urticaria is not contagious, it is not an infectious disease, but a chronic allergic skin allergic reaction disease. Its cause is mostly due to allergic factors, that is, according to individual differences and the formation of an autoimmune or allergic skin disease. Therefore, it is not contagious or infectious, only allergens. If there are obvious allergens, generally try to avoid contact with allergens, you can avoid the occurrence of chronic urticaria. Some people who have chronic urticaria can’t find any allergens and don’t know what causes chronic urticaria.