Allergic purpura belongs to the skin vasculitis disease, usually will not affect the life expectancy, but need specific analysis in each case. Allergic purpura can be clinically divided into simple allergic purpura, arthritic allergic purpura, abdominal allergic purpura, renal allergic purpura, and compound allergic purpura. This disease is a common capillary allergic disease, usually benign lesions, so it usually does not affect the life expectancy of patients. The main clinical manifestations are skin purpura, gastrointestinal mucosal bleeding, painful joint swelling and nephritis, etc. A few patients may also have angioneurotic edema. Some patients can have recurrent attacks with re-exposure to allergens. In some severe gastrointestinal and renal patients, treatment with glucocorticoid preparations, immunosuppressants, and even plasma replacement cannot improve clinical symptoms and may be life-threatening, but the specific survival period is uncertain. Patients are advised to consume more foods rich in vitamin C during the recovery period of allergic purpura, and actively participate in physical activities to enhance physical fitness and improve resistance to disease.