Urticaria is a common clinical skin disease, and the signs of gradual improvement are often reflected in the frequency of attacks, the area of lesions, changes in the color of lesions, and the elimination of triggers. 1, the frequency of attacks is reduced: acute urticaria edema symptoms in a few minutes to a few hours to reduce, and the wind mass into red spots and gradually disappear, leaving no trace. Chronic urticaria is usually recurrent for months or years, but when it improves, the symptoms will gradually decrease and the frequency will be significantly reduced; 2. The area of the lesions is reduced: urticaria can appear in any part of the skin, with a large area distribution, such as the trunk, limbs, lips, eyelids and other parts, and the affected area can appear after scratching the skin scratching signs. When it improves, the urticaria and erythema are reduced and generally only exist on the trunk or extremities; 3. Lighter color: when urticaria is severe, it appears as bright red erythema and urticaria, but when it improves, the color becomes light red; 4. Resistance to triggers: urticaria can be triggered by food such as fish, shrimp, crab, shellfish, eggs, etc., plants including mushrooms, strawberries, tomatoes, certain food additives, as well as drugs, pollen, animal dander, dust, etc. After improvement, there is obvious resistance to the above mentioned triggers or causes, and the disease may not occur upon contact or use.