患者,男,54岁,2007年11月进食螃蟹后出现双下肢散在紫癜,略高出皮面,暗红色,不伴有瘙痒感,有轻微腹痛,无骨关节疼痛。血尿粪常规正常,过敏原检测均阴性,自身抗体检测均阴性。诊断为过敏性紫癜混合型(皮肤及消化道累及)。以糖皮质激素、氯雷他定及维生素C治疗,紫癜可以消退。出 Patients, male, 54 years old, appeared in November 2007 after eating crabs scattered lower extremity purpura, slightly above the skin, dark red, not associated with itching, mild abdominal pain, no joint pain. Normal urine and urine stool, allergen testing were negative, autoantibodies were negative. Diagnosis of mixed allergic purpura (skin and gastrointestinal involvement). Glucocorticoid, loratadine and vitamin C treatment, purpura can be dissipated. Out