Allergic purpura is a common allergic vascular inflammatory lesion with a high recurrence rate. Recurrence may lead to central nervous system lesions, intestinal hemorrhage, kidney damage, and even develop into chronic nephritis and renal failure, which may lead to death if the condition is serious, and regular review is needed to prevent recurrence after treatment. There are more causes of recurrence of allergic purpura, mainly due to complications, such as intestinal hemorrhage may cause hemorrhagic shock and lead to death; the presence of large amount of proteinuria, azotemia, hypertension or hypertensive encephalopathy, acute renal failure and other diseases may lead to death due to uremia. If it develops into chronic nephritis, it will also lead to death due to renal failure; a small number of patients will develop central nervous system lesions, convulsions, coma, limb paralysis, etc., which can be life-threatening leading to death. Therefore, patients with allergic purpura need to pay attention to prevention, adjust their diet, prohibit the consumption of food that may cause the aggravation of the disease, avoid exertion, pay attention to warmth, to avoid infection caused by cold. At the same time, it is necessary to follow the doctor’s prescription to reduce the hypersensitivity state. In addition, the key to prevent recurrence is regular review to keep abreast of changes in the condition. Patients with normal urinalysis should be followed up for at least six months, and those who still have abnormal urinalysis after 6 months should continue to be followed up for 3-5 years to prevent the progressive deterioration of kidney function.