blue nevus

例句：

1. 1. The doctor found a blue nevus on his patient's arm.
   医生在他的病人手臂上发现了一个蓝痣。
2. 2.She was surprised to see a blue nevus on her friend's face.
   她惊讶地看到她朋友的脸上有一个蓝痣。
3. 3. The blue nevus on his forehead has always been a source of curiosity for him.
   他额头上的蓝痣一直是他好奇的源泉。