If I had to guess, I'd say you have a bone contusion (essentially a deep bruise). I had one of these on my knee...it took forever to be pain free. But as Tim said, get it checked out (assuming you have insurance). It would be shame to ride again, really mess something up, and then be told, "If you had just had an X-ray, we would have seen this problem and saved you a lot of trouble."
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