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Professor Snotsengabber, a charter member of S.N.O.T.S.
It could be a lot of things, and you really need a doctor to examine you to know for sure. One thing could be a floating rib. You may be pressing it in when you sleep on your stomach. Or it could be something completely different. An x-ray would help. So would a few other tests that only a doctor can do in person.
