In the lower part of the tongue at the very back next to the wisdom tooth, it seems that there is a lump of some kind. It doesn't hurt, but I can't tell if it's hard or soft. It is look like 2nd floor tongue. I also notice some blue tinge on the tongue on that side.There are papillae on the "bump" itself. There is no such thing on the right side of the tongue. What could this be?