Allergic purpura is a common capillary allergic hemorrhagic disease. It is caused by a metamorphic reaction of the body to certain allergenic substances, resulting in extensive small vessel vasculitis, followed by increased permeability and fragility of the vessel wall, bleeding and edema of subcutaneous tissue, mucous membranes and internal organs. The onset may be related to bacterial, viral or parasitic infections and drugs, food, etc. The clinical picture is mainly skin purpura, which may be accompanied by arthritis, abdominal pain and nephritis. In the treatment we have to pay attention to the following points: 1, although some patients can be clinically self-healing, but also to pay enough attention to the active treatment, and should not be negative treatment, day by day there is the possibility of involving the kidneys. 2, allergic purpura patients to avoid strenuous activities, but not completely bed rest. 3, do not rely excessively on allergen testing to find the cause of the disease, very most patients allergen testing is negative. The actual fact is that you will be able to get a lot more than just a few of the most effective and most effective. 5, the appearance of nephritis performance as early as possible treatment, it is best to check the urinary routine once a week; even if there is no nephritis performance, you need to regularly recheck the urinary routine, at least 6 months. 6. It is best to combine Chinese medicine treatment to control recurrence. Generally, you need to adhere to oral Chinese medicine for at least 2 months after the clinical rash subsides. 7. Because TCM requires dialectical medication and prescription medication needs to be adjusted, patients are advised not to self-administer medication from the Internet or other sources, but to consult a regular hospital for prescription. 8, patients with family history will increase the incidence of purpura nephritis.