1临床资料患者女,59岁。膝、臀部黄红色皮疹2个月。2个月前患者膝部出现数个米粒大小黄红色丘疹,渐累及臀部,并且增多增大,无破溃及融合,无明显痒痛感。近来饮食较油腻(喜食羊肉),糖尿病病史10余年,口服降糖药控制中,空腹血糖 1 Clinical data Female patient, 59 years old. Knee, yellow red rash 2 months. Two months ago, there were several yellowish-red papules in the knee of the patient’s knees, which gradually increased and increased. There was no rupture and fusion without obvious itch pain. Recent diet is more greasy (like mutton), a history of diabetes more than 10 years, oral hypoglycemic agents, fasting blood glucose