Without examination,it is difficult to confirm a diagnosis,but from your description it looks like a mucocele.It is a rubbery, bubblelike painles swelling. It is usually inside the lower lip,under the tongue or the inside of mouth and caused mainly by biting the lips or trauma during eating of food.It is non contagious.
Usually it goes away on its own.But if it does not,then corticosteroid injections and surgical removal by scalpel or laser are done by a dermatologist.It then has to be differentiated from other mucocutaneous lesions also.Also take vit B supplements for some days.
Hope it helps. Take care and pls do keep me posted on how you are doing or if you have any additional queries.Kind regards.
I too have this same sort of lump inside my lower lip, for many years now. It has never been painful for caused me any discomfort so I have just ignored it for the most part. That is until now. I woke up to find my lower lip swollen and the lump very tender. Then I noticed on the inside of my lip it appears the lump has ruptured. I was able to squeeze out some pus-like fluid and a fair amount of blood. The area is not as tender now, however still swollen, going on 2nd day.
I have one small round bump in the posterior part my lower lip. Doesn't hurt but I feel discomfort as it gets rubbed with teeth that I poke it with needle and drain fluid, mostly blood accumulated. But it never goes away. I have it for last 6-7 months. I tend to bite it thinking that it may have developed pus and it turns out wrong. HELP please.