Urticaria, commonly known as wheal, rubella, papule and rash, is a common skin disease. Urticaria is a kind of local edematous damage caused by various factors, such as temporary inflammatory hyperemia of skin mucosa and blood vessels and a large amount of fluid exudation. Sudden appearance of red lumps on local or whole skin, with quick onset, quick regression and itching. Urticaria can be divided into acute urticaria, chronic urticaria, angioneurotic edema and papular urticaria. The pathogenic factors of urticaria are complex, and some foods, contact with irritating substances, cold and heat allergies, etc. may cause this disease. If you have urticaria, you should stay away from allergens in time and choose professional drugs for treatment to prevent the disease from getting worse. Then, the onset of acute urticaria is more acute, and skin lesions often appear suddenly. It is a localized red air mass with different sizes, clear boundaries and different shapes, which can be round, quasi-round or irregular. At first, it is isolated and dispersed, and can gradually increase with scraping, and merge into a non-plastic, ground figure or ring. For example, the serum in the microvessels oozes out quickly, pressing the wall of the tube, and the wind mass can be pale, red around, and the skin is uneven and orange peel-like. Skin lesions usually subside naturally from half an hour to several hours, leaving no trace after they subside, but new wind masses appear one after another, which can appear repeatedly within 1 day. Consciously severe itching and burning sensation. In addition, dermatoglyphics can be positive Blood routine examination showed eosinophilia. If there is severe staphylococcus aureus infection, the total number of white blood cells increases or the cell count is normal, the percentage of neutrophils increases, or there are neutrophils at the same time. The location is uncertain, which can be all over the body or limited to a certain part. Sometimes mucosa can also be involved, such as gastrointestinal tract involvement, causing mucosal edema, nausea, vomiting, abdominal pain, diarrhea and other symptoms. When the laryngeal mucosa is invaded, chest tightness, asthma and dyspnea occur, which can cause laryngeal edema and suffocation in severe cases, which is life-threatening. If accompanied by high fever, chills, rapid pulse and other systemic symptoms, we should pay special attention to the possibility of serious infection such as sepsis.