先证者　男,22岁。躯干部及上肢先后出现淡褐色点滴状斑疹10年,夏季加重,出汗时有微痒。家族中现有6人患同样疾病,发病年龄均在14岁左右,临床表现基本相同,另有第三代1男1女分别为7岁和8岁未发病。皮肤科情况:躯干部及上肢见有多数点滴状斑、散在或部分融合的淡褐色斑疹,以胸背 The proband is male, 22 years old. Trunk and upper limbs have appeared brown spotted rash 10 years, increased summer, slightly itching when sweating. The existing family of 6 suffering from the same disease, the age of onset are around 14 years old, the clinical manifestations are basically the same, while the third generation of 1 male and 1 female were 7 years old and 8 years old without disease. Dermatology: trunk and upper limb see the majority of spotted spots scattered or partially fused light brown rash with chest and back