Tommboy. There are only 3 things this could be. A bruised tail-bone (coccyx), an abcess, or what's called a pilonidal cyst. From your post, I bet you have a bruised coccyx (or at worst, a fracture). Usually no need to have the thing x-rayed bc the treatment is the same for both. Avoid sitting for long periods of time; ibuprofen 600-800mg 3-4 times a day; and high fiber and/or metamucil or other stool softner to avoid constipation. (If you think it hurts now, wait until you have to strain!) Rarely do these things have complications requiring a hospital visit. The bad news is prolonged healing-it takes weeks. Sometimes a little foam donut to sit on will make life easier. If it's not getting better in 2-3 weeks or if at any time you feel a lump that's warm, red and painful you need to get it checked out. Otherwise you should be fine. Good luck!