abscess

n. 脓疮,溃疡

The tip of an abscess, a boil, or a pimple, in which pus forms.

脓头中间有脓液的脓疮、疖或丘疹的顶端

I think I have an abscess on my gums. This could be serious.

我想我的牙床上有个脓疮，这可能是严重的。