I have had a lump behind my wisdom tooth for several years now. it almost seems between my mouth and nose. it never seems to change size. what is it?

Hard to say: if it never changed size or texture or color it could be either a piece of bone or even a thickening of the gum. You ready should have some one look at it... Because it may be ok for Now!

Lump: Given the length of time the lump has been there it is most likely normal tissue however to ease your mind I would have your dentist or oral surgeon look at it to give you an exact diagnosis.

Vague: Hard to say without a x-ray and an exam. To ease your doubts, I would have it checked