遗传性对称性色素异常症(dyschromatosis symmetrica hereditraja)是一种少见的先天性家族性遗传病。以肢端对称性色素异常为特点,皮疹为粟粒至黄豆大小的色素沉着与脱色斑,相间分布,呈点状或网眼状。本病首先在日本报导,1959年起我国亦有报导,1985年作者发现一家系,现报告如下。例1 (Ⅳ_6,先证者),男,5岁。2岁左右起病,主要症状为双手、双足背有弥漫性黄豆大小色素脱色 Hereditary symmetric dysythema (dyschromatosis symmetrica hereditraja) is a rare congenital familial genetic disease. Acromelar is characterized by abnormalities in the limbs, the rash is the size of the miliary soybeans to pigmentation and bleaching spots, phase distribution, was a dot or mesh-like. The disease was first reported in Japan. Since 1959, there have also been reports in our country. In 1985, the author discovered a family. The report is as follows. Example 1 (Ⅳ_6, proband), male, 5 years old. 2-year-old onset, the main symptoms of both hands, feet with diffuse soy color pigment discoloration