I think you should see a doctor. This sounds like something that is progressing and has been with you for long enough to warrant getting it checked out.
Take care.
Many thanks for your comment and recommendation
Marvalyn
This is the second time that I have had a bump on my bottom lip, it's under the skin, on the left side, mostly painless unless I bite it.
I have a bad habit of biting my lips, and this usually appears when I'm stressing out. There is a vitamin that I took before and it made the bump disappear by the next day. I can't remember what exactly the vitamin is called-- but know that this isn't something you have to run to the doctor for and its not oral cancer.