患者男,52岁,2004年1月23日入院。入院前4周因右踝关节肿痛在外院诊断为“痛风”,口服别嘌醇100mg、2次/d治疗。入院前1天躯干、四肢皮肤出现红斑,面部红肿伴瘙痒,在我科诊断“药疹”,嘱停服别嘌醇,予地塞米松10mg静脉滴注,次日收住院治疗。患者既往体健,否认肝炎、结核病史及 Male patient, 52 years old, was admitted to hospital on January 23, 2004. 4 weeks before admission due to right ankle swelling and pain in the hospital diagnosed as “gout”, oral allopurinol 100mg, 2 times / d treatment. One day before admission, the trunk, erythema and limbs with erythema on the skin of the extremities, and facial itching were diagnosed in our department. Allopurinol was stopped and intravenous drip of dexamethasone 10 mg was given to the hospital the next day for treatment. Past patient health, denied hepatitis, tuberculosis history and