What is a lump on the inside of the lower lip?

You need to see a dentist or an oral surgeon. The lump could be any number of things including oral cancer. The dentist can assess the lump and perform a biopsy if necessary.

Intra-labia

I have a black strange bump inside my upper lip also..it looks like a scar.in the day time its camoflauge..but at night time from a certain view you can notice it,and its nothing preety!! i need it...

Maybe a mucocele. See http://www.kadavy.net/blog/posts/lump-in-mouth-or-lip-maybe-a-mucocele/Maybe a mucocele. See http://www.kadavy.net/blog/posts/lump-in-mouth-or-lip-maybe-a-mucocele/It sounds...

Well, this is a sore. It should look white, like somebody had a miniature nuclear war in your mouth, right? Yes. So, this happens wen you bite yourself when you eat too much junk food. Don't worry. A...