遗传性对称性皮肤异色症（Dyschromatosis symmetrica hereditaria）是一种罕见的先天性皮肤病。1985年9月我科遇到一例,现报告如下: 病 例 报 告 患者王××,女,29岁,小学教师,甘肃山丹人。 病史:主诉四肢对称性皮肤色素异常23年。从5—6岁开始发现双手足背部出现小米粒大小圆形或椭圆形色素斑点,因无自觉症状,未引起注意。从12—13岁起色素斑有增多倾向,手背向上蔓延至前臂,足背向上 Hereditaria Symmetry Hereditaria is a rare congenital dermatosis. In 1985 September we encountered a case, the report is as follows: The patient reported Wang × ×, female, 29 years old, primary school teacher, Gansu Shan people. History: Complaints of limb symmetry of skin pigmentation abnormalities 23 years. From the age of 5-6 years began to find the back of his hands appeared millet grain size round or oval-shaped pigment spots, because no symptoms, did not pay attention. From 12-13 years old pigmentation spots have increased tendency to spread back to the forearm forearm, dorsal upward