This heterogeneous group of disorders is characterized by inflammation of small blood vessels. Hypersensitivity vasculitis may occur as a primary disease or in association with an underlying illness such as a connective tissue disorder or malignancy. Patients show any one of a number of different skin lesions; visceral organ involvement may also be present. The prognosis is generally good. Remission may be hastened by a brief course of corticosteroids.
这类异质性疾病的特征是小血管炎症。超敏性血管炎可作为原发性疾病出现，或与潜在疾病如结缔组织病或恶性肿瘤相关。患者可出现多种不同的皮肤损害中的任何一种；也可能存在内脏器官受累情况。总体预后良好。短期使用皮质类固醇可加速病情缓解。
