Molly Bloom
Sometimes they do. I think they suggested I put ice on it, and of course offered pain killers. Sometimes it can be removed surgically, but most of the time it comes back. They suggested not to "hit" it as it could cause problems as the stuff disperses into your system.
After my football incident, mine did come back, but wasn't very big. I just sort of live with it, and this doesn't hurt.
No one knows why they form. Weird, isn't it?
Molly