nevus sebaceus

例句：

1. 1. He had a nevuson his forehead that he'd neverbeen able to get rid of.
   他额头上有一颗痣，他一直没能去掉。
2. 2. Shenoticed the small nevus on herarm and wondered if it was something serious.
   她注意到手臂上的一个小痣，想知道这是否严重。
3. 3. The doctor removed the nevus from his face during the surgery.
   医生在手术中将脸上的痣切除了。