What is the clinical manifestation of urticaria?

Urticaria is a common allergic disease of the skin and mucous membrane characterized by intense itching and localized edema. It is characterized by sudden wheals on the skin that subside after a few hours, usually no more than 24 hours, occur in batches, sometimes repeated several times a day, and are bright red or pale. The two wheals vary in size, with the largest being 10cm or larger in diameter and sometimes showing blisters on the surface of the wheal. Generally dispersed arrangement, can fuse with each other, forming a ring, map and other irregular shapes, can be generalized, subside without traces, there is severe itching, or burning feeling. Such as digestive tract involvement, can show nausea, vomiting, abdominal pain, diarrhea, throat and bronchial involvement, can show laryngeal edema, asphyxia, dyspnea. According to the different course of disease, can be divided into acute and chronic urticaria, acute attack generally 1-2 weeks can stop; Chronic urticaria usually exceeds 6 weeks and recurs.