Young men entering puberty commonly have smooth, round lumps or "breast buds" under the nipple.These lumps appear because of rapid changes in hormone levels. They are not dangerous and usually disappear in a few months. Many teenagers, as they progress through puberty have this problem.
As far as cancer goes, rest assured, it is highly unlikely that this is the case.
Sexual Maturity Rating (SMR) usually begins at about age 12 or 13 years and lasts a year or so.
If you are too worried about it,you could to take your son to your family doctor to check this lump for a proper diagnosis.
Best wishes to both of you.
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