Urticaria is a common skin disease, which is mainly caused by temporary inflammatory congestion of mucosal blood vessels and local edema damage caused by a large amount of fluid exudation. It usually happens at night without any warning. When urticaria occurs, small red papules or lumps will appear everywhere on the skin of the body, often accompanied by unbearable itching. If you grasp it by hand, you will catch more and more pieces. Urticaria, commonly known as small wind group and feng shui pimple, is a common skin disease. There are a wide range of patients with urticaria and many causes, so it is difficult to find out the cause of urticaria accurately. However, the onset time of urticaria is mostly in the evening, and the patient's skin will produce small red lumps with itching, which will exist alone or continuously. The more severe the monthly scraping, the shorter the onset time, and the natural skin will return to normal after the onset. Mild urticaria is a common allergic disease of wheal skin. After contact with allergic things, the skin will get hot, and small lumps will appear slowly. Small lump with abnormal itching. If the patient can't control it, he will grab it by hand, but the more he grabs it by hand, the more it will appear. The onset time is short, and the disease will pass in ten minutes. The skin will automatically return to normal state, leaving no trace on the skin. Urticaria.