患者男 ,19岁 ,汽车司机。主诊 :颈双侧、身躯、外生殖器出皮疹瘙痒二月。二月前不明原因的先于双前臂屈侧出数个米粒大紫红或褐红扁平丘疹 ,自觉瘙痒 ,约经数日向上臂及胸腹部蔓延 ,部份密集融合成片。近一月来因工作繁忙 ,睡眠欠佳 ,皮疹突然增多 ,波及全身。平时一般身健 , Patient male, 19 years old, car driver. Main line: neck bilateral, body, external genital rash itching February. Two months ago before the unexplained double forearm flexed a few grains of large purple or brown flat papules, consciously itch, about a few days to the upper arm and chest and abdomen spread, part of the intensive integration into pieces. Nearly a month due to busy work, poor sleep, rash suddenly increased, affecting the whole body. Usually normal health,