患儿男， 54天。因额部淡褐色斑 34天，于 1999年 7月 9日就诊。患儿生后 20天其母发现患儿额部呈粟粒大小圆形点状斑疹，表面有细薄鳞屑，渐发展为黄豆大淡褐色圆形斑，数目增多，未作治疗。家族史：患儿祖母胸背部有类似损害，并与患儿有接触史。皮肤科情况：患儿前额、眉间 Children male, 54 days. Due to the amount of light brown spots 34 days, July 9, 1999 treatment. 20 days after birth, his mother found that the amount of the Ministry of the child was a miliary dot circular spot-like rash, thin scales on the surface, the gradual development of a large brownish brown spot for soybeans, the number increased, not for treatment. Family history: children with similar damage to the chest and back of grandmothers, and children have contact history. Dermatology: Children forehead, eyebrows