Urticaria needs to be differentiated from papular urticaria, urticarial vasculitis and other diseases. 1. Urticaria belongs to a kind of allergic disease, in the clinic with the sudden appearance of the main features of the wind, and at the same time, accompanied by intense itching, the symptoms of severe, and may even panic, irritability, nausea, vomiting, abdominal pain, diarrhea, and respiratory difficulties and so on phenomena. 2. papular urticaria, also known as insect bite dermatitis, is due to mosquito bites and skin diseases, in the clinic is mainly manifested as small pimples, accompanied by intense itching, children are the most common population of papular urticaria. 3. Urticarial vasculitis, also known as hypocomplementemic vasculitis, is also a new type of immune complex disease, which is mainly manifested in the clinic with erythema and annular erythema-like damages, and petechiae can be seen in the central part. In addition, fever, joint pain, abdominal pain and enlarged lymph nodes may occur. Due to individual differences in clinical manifestations, a doctor’s consultation is required for specific cases.