OMG@ some people on this thread, no wonder our ambulance and hospital staff are always stretched. I once burnt the skin off my whole arm with burning hot toffee fresh from the stove, i didn't go to hospital, i kept it in some cool water for a few hours, little bit of cream, and a bandage, sorted. I was 6 years old.
Talk about over reacting.
You've said it's small, so just keep eating bread or food along those lines, something that may move the bone.
If it doesn't move soon, or it becomes really uncomfortable, or you start having real difficulties, THEN phone your local GP or hospital and just expain to them what's happening and ask if there's anything you can do, if you've done all that they have suggested, then give them a visit.