Ota's nevus

例句：

1. 1.The doctor found a mole on his arm that he had never noticed before.
   医生在他的手臂上发现了一个他以前从未注意到的痣。
2. 2. She applied the spot remover to her skin and waited for it to dry.
   她将去斑剂涂在皮肤上，等待它干燥。
3. 3.He was surprised to see a mole on his cheek that he hadn't noticed before.
   他惊讶地发现他的脸颊上有一颗他以前从未注意到的痣。