What is this hard lump on my cheeck after my wisdom tooth surgery?

This is the 5th day after ive gotten my 4 wisdom teeth removed and the swelling has gone down a considerable amount but on my right cheek back pretty far next to my upper molars is a hard peace of cheek about the size of a nickel or a quarter. Will this go away and is it dangerous at all. It kind of hurts and I would really appreciate some feed back. Im 14. PLEEEAASSEE HELP!!!