这个水果表面有一个奇怪的突起。

There's a strange ___protuberance on the surface of this fruit.

她的额头上有一个小突起。

There was a small ___protuberance on her forehead.

医生检查了患者额头上异常的肿块。

The doctor examined the abnormal ___protuberance on the patient's forehead.