The recovery period of nephritis caused by allergic purpura is related to the severity of the patient’s condition, treatment plan, individual patient’s condition and other factors, and there are individual differences in the time of healing, renal damage occurs after 1 week of purpura, and most of them are recovered in 3-4 weeks, and it is difficult to assess the time of healing for the development of chronic nephritis in a small number of patients, which can last for several months or even several years. There is no specific treatment plan for the treatment of purpura fulminans. Symptomatic treatment is the mainstay, such as the application of glucocorticosteroids (prednisone acetate), immunosuppressants (cyclosporine, sodium mescaline) and so on. Most of the renal damage caused by allergic purpura appears 1 week after the appearance of purpura, and the renal damage mostly recovers within 3 to 4 weeks after active treatment. For some patients if the treatment is not timely, and also some patients relapse after cure, it may develop into chronic nephritis, the recovery time is more difficult to determine, and there are individual differences, the recovery period may be in months or even years. Allergic purpura nephritis patients, need to regular hospitals, under the guidance of doctors, active treatment, regular review of renal function, as soon as possible to cure, so as not to delay the development of chronic nephritis.