White bump in my mouth, what is it?

Perhaps it is an: Infection called a fistula. It would have to be seen in order to diagnosed. Make sure you see a dentist as soon as possible. Untreated infections can result in unexpected emergencies as well as serious complications.

Maybe infection: An infection that is draining into your mouth will form a white blister. The trick is to have your dentist determine the cause of the infection and to treat it. Feel better soon..