It's called a Tori.
Ever heard of the word?
A tori is a lump of bone that resides in the mouth.
Most people that have tori think nothing of it because they have always had it.
Well, not everyone does have it.
But even if you do have it it really not that big of a deal.
Its just bone and likely wont ever cause you any problems.
One of the only times that it may cause you problems is if you need a denture.
Dentures are very hard to fabricate over the top of tori.
It is only a minor problem however due to the fact that tori can be removed.
So if you have a hard boney lump that has been in your mouth forever,
it may not hurt to get it checked out, but more often then not its simply just a tori.
Tori in the floor of the mouth.
Tori in the roof of the mouth.