Allergic purpura may involve the kidneys, and based on its clinical manifestations, involvement of the kidneys is also known as renal-type allergic purpura. The pathogenesis of purpura is unknown, and it is now believed that it is mainly related to immune abnormalities, and is a common vascular allergic reaction disease. The occurrence of purpura on the basis of skin purpura, when the inflammatory reaction involves the glomerular capillary collaterals will be a series of clinical manifestations, the appearance of proteinuria, hematuria, and occasionally see edema and renal failure. Renal damage may occur 2 to 4 weeks after the onset of purpura, or sometimes it may be delayed. Most patients recover completely, and in a few cases recovery is difficult. If the diagnosis of purpura is confirmed, it is recommended to follow the doctor’s instructions for standardized treatment as early as possible in order to reduce the adverse effects of the disease.