”Purpura includes allergic purpura and thrombocytopenic purpura, both of them are characterized by bleeding from skin and mucous membrane, but the clinical manifestations, etiology and prognosis are different, therefore, early detection and early treatment are important. In recent years, the incidence of allergic purpura is higher in children, and the detection is often late, and the treatment takes a detour, resulting in aggravation or even complications. The allergic purpura is divided into skin type, joint type, abdominal type, kidney type, and several types of clinical evidence can appear at the same time, called mixed type. It is often seen in the skin type, manifesting as symmetrical bleeding spots on both lower limbs, which is not easy to detect, the joint type is often misdiagnosed as arthritis, and the abdominal pain type is often misdiagnosed as acute abdomen. The renal type often appears after other types and is characterized by bleeding in the urine, which is also relatively more difficult to treat, so early detection is very important. It often occurs after an external infection, such as upper respiratory tract infection, rhinitis, a week or half a month after tonsillitis, or after exposure to allergens such as renovated houses, new furniture, drug allergies, etc. For the treatment of skin type, hormones can be dispensed with in the early stage, and Chinese medicine is a better treatment method. If it has developed into kidney type and then consider using hormones is possible, then the combination of Chinese and Western medicine is the best treatment. Do not underestimate the effect of Chinese medicine on this disease, often Chinese medicine can shorten the disease, such as the premature use of hormones, the later treatment of the disease will be more difficult. Therefore, early diagnosis and early treatment of this disease is the most short-cut choice.