I don't know either, but obviously I'm here because I have been having the same type pain. I"ve had a lot of other strange things go on as well and my doctor's have been of no help to me. If you find out, please post.
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it is a gland (usually the salivary gland) that comes about sometimes when your sick or have a coldsore.
Generally a painful bump on your chin is acne. Acne is common skin problem that starts when oil and dead skin cells clog up pores.