患者男,42岁。因右上肢皮疹5年于2001年3月在本科诊。患者5年前无明显诱因发现右上臂出现一米粒大丘疹痛,不痒,逐渐增至黄豆大。患者因要求手术切除遂来我院诊。患者既往体健。系统检查未见异常。皮肤科检查:右上臂侧可见一直径约0.8cm的结节,呈红褐色,表面光滑(图1)之较硬。临 Male patient, 42 years old. Due to the right upper limb rash 5 years in March 2001 in the undergraduate clinic. 5 years ago, there was no obvious incentive for the patient to find one meter in the right upper quadrant papules pain, itch, and gradually increased to soybeans. Patients due to require surgical resection came to our hospital. Past patient’s health. No abnormal system check. Dermatology examination: the right arm shows a diameter of about 0.8cm nodules, reddish brown, smooth surface (Figure 1) of the harder. Pro