The possibility of hives is high when a rash like a tumbleweed appears on the face. Urticaria belongs to a kind of allergic reaction, hot and cold stimulation, bacterial, viral, and protozoal infections, eating or contact with certain allergens, dust mites, pollen, cat hair, dog hair, etc., may lead to the emergence of urticaria. Severe cases may have laryngeal edema or anaphylaxis, so it is recommended to give timely treatment, mainly choose oral antihistamine drug treatment, common antihistamines are loratadine, cetirizine, cyproheptadine, paracetamol, etc., according to the age and physical condition, choose the appropriate oral drug treatment. At the same time, must pay attention to avoid hot and cold stimulation, avoid scratching, so as not to aggravate the rash, recurring person is best to line allergen examination.