purpura form dermatitis medicamentosa

例句：

1. 1. The patient developed purpura on his legs after a severe allergic reaction.
   这位病人在严重过敏反应后，腿上出现了紫癜。
2. 2. Purpura is a common symptom of autoimmune diseases such as lupus.
   紫癜是自身免疫疾病如红斑狼疮的常见症状。
3. 3. He was diagnosed with purpura nephritis and required immediate treatment.
   他被诊断为肾炎型紫癜，需要立即治疗。