Urticaria is commonly known as rubella. It is a limited edematous reaction due to dilatation of small blood vessels in the skin and mucous membranes and increased permeability, which usually subsides within 2 to 24 hours, but new rashes occur repeatedly. The course of the disease extends from several days to several months. Causes of urticaria: The causes of urticaria are very complex, and about 3/4 of patients cannot find the cause, especially chronic urticaria. The common causes are: food and food additives; inhalants; infections; drugs; physical factors such as mechanical stimulation, heat and cold, sunlight, etc.; insect bites; mental factors and endocrine changes; genetic factors, etc. Treatment of urticaria: Because of the different causes of urticaria, the treatment effect is not the same. Specific measures for treatment are as follows: 1. Remove the cause: For each patient, you should try to find the cause of the attack and avoid it. If it is caused by an infection, the infected lesion should be actively treated. Those who are caused by drugs should stop using allergy drugs; those who are caused by food allergy, find out the allergic food, do not eat this food again. 2, avoid triggering factors: such as cold urticaria should pay attention to keep warm, acetylcholine urticaria to reduce exercise, sweating and mood swings, contact urticaria to reduce the opportunity to contact.