Allergic purpura can be divided into simple allergic purpura, abdominal allergic purpura, arthritic allergic purpura, renal allergic purpura and mixed allergic purpura according to different clinical manifestations, as follows: 1, simple allergic purpura: the most common, belongs to the lighter, mainly manifested as skin purpura, limited to the extremities, especially the lower limbs and buttocks, trunk area rarely involved; 2, abdominal allergic purpura In addition to skin purpura, the involvement of capillaries in the mucous membrane of the digestive tract and the dirty layer of the peritoneum produces a series of digestive symptoms and signs, such as abdominal pain, vomiting, diarrhea and blood in the stool, among which abdominal pain is the main clinical manifestation; 3, joint-type allergic purpura: In addition to skin purpura, the involvement of blood vessels in the joints causes joint swelling, pain, pressure pain and dysfunction; 4, renal-type allergic purpura. The most serious disease, on the basis of the skin purpura, due to the inflammatory reaction of glomeruli, capillary collaterals and appear hematuria, proteinuria, occasional edema, hypertension and renal failure; 5, mixed type of allergic purpura: in addition to the performance of skin purpura, but also combined with the above-mentioned other types of clinical manifestations.