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nodule type in left side below nipple in male

my son is 15yrs, he recently noticed a small nodule/lump like thing may be around a groundnut size under his left nipple. Its not visible externally, pains slightly when pressed, but its just few days and find it to have doubled but its with same pain symptoms (slight pain when pressed). what could that be, One more thing is he recently has got facination toward doing exercise and startd doing push-ups. can you please advice, what could that be.
2 Responses
134578 tn?1546634665
It could be a cyst.  He should see the doctor to rule out anything more serious.
Avatar universal
He is beginning in the age of pubery, that is the forming of breast tissue. Normally, he would experience this b4 he turned 15, it should be in a stage of development before anything else because it is the beginning of muscle tissuein his pectoral area... Does he have any pubic hair? If so, than he may have just kicked on the process of muscle growth since  he has started to begin working out...
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