过敏性紫癜为微血管的变态反应性疾病,多见于儿童时期。其主要病变为真皮内血管周围有炎性渗出,除毛细血管周围有炎性渗出外,微小动脉与微小静脉也受累。历年来在我国各地不断有关此病的报导,各地区发病季节不同,并均认为系男多于女,但比例有所不同。此病的病因学尚未肯定,可能与多种因素有关:如食物、药物、 Henoch-Schonlein purpura is an allergic microvascular disease, more common in childhood. The main lesion is dermal intravascular inflammatory exudate, in addition to inflammatory exudate around the capillary, the tiny arteries and veins also involved. Over the years, reports of this disease have been continuously made in various parts of our country. Different regions have different onset seasons and all consider men to be more males than females, but the proportions are different. The etiology of the disease is yet to be determined and may be related to a variety of factors such as food, medicine,