It is usually inside the lower lip, under the tongue or the inside of mouth and caused mainly by biting the lips
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 is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor.