I am 15 years old and I have 2 lumps directly in the center of my mouth. They were there a couple of months before I went to the dentist. She told me she was not sure what they are. I heard the same thing from my Orthodontist and from the Endontist I was refered to. I had an expander, but it didnt touch that area. The front lump varies in size but the back one stays pretty big. Can anyone tell me whats wrong?