1病例介绍患儿，男性，9岁，主因双下肢膝关节皮肤损伤伴肌肉硬化5年而就诊。于5年前无明显诱因出现双手小关节皮肤损伤，呈暗红色并伴有白色皮屑，无触痛及压病，后自觉左下肢乏力感，同时累及右下肢并发现左膝周围皮肤损伤，肌肉肿胀且逐渐变硬。病情迁延发展，后出现额部皮 1 case description Children, male, 9 years old, mainly due to bilateral lower extremity knee skin injury with muscle sclerosis for 5 years and treatment. 5 years ago, there was no obvious incentive to appear small hands and joints of the skin damage, dark red and accompanied by white dander, no tenderness and pressure disease, conscious left lower extremity fatigue, and involved the right lower extremity and peripheral skin lesions found around the left knee, Muscle swollen and hardened. Prolonged development of the disease, after the amount of the amount of skin