过敏性紫瘢为非血小板减少性紫瘢,血小板及其他凝血因子均正常,其出血乃因某些因素使血管机能受害而引起,因此,过敏性紫瘢属于血管紫瘢之一种。若仅皮肤出现紫瘢者,称为单纯型紫瘢,如波及胃肠道而发生胃肠道症状者,称为Henoch氏紫瘢,或称腹型紫瘢,如波及关节者,称为Schonlein氏紫瘢, Allergic purple scar non-thrombocytopenic purpura, platelets and other coagulation factors are normal, the bleeding is due to certain factors that cause vascular damage, therefore, allergic purpura is one of the vascular scar. If only purple skin scarring, known as the simple type of purple scar, such as the gastrointestinal tract involved in gastrointestinal symptoms, known as Henoch’s purple scar, or abdominal purple scar, as spread to the joints, known as Schonlein Purple scar,