Several reasons: Could be the skin or its appendages,(e.g. hairs, hair follicles, etc.), muscles in this area, bones (top of rib cage, or other structures in the armpit. NSAIDS, unless contraindicated would help, till you see your doctor for assessment, good luck
Answered 8/16/2019
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A doctor has provided 1 answer
A doctor has provided 1 answer
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A doctor has provided 1 answer
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