While men have nipples just like women, they serve no functional purpose. Men do not get pregnant nor do they have to breast feed so the role of the nipple-areolar complex is essentially decorative. While men may look peculiar if they did not have nipples, because we are used to seeing all humans with them, they are present in men as a result of pure genetics. The XY chromosome that men have does not start emitting testosterone until over a month into pregnancy. But up until that point the embyro acts like a female, creating nipples which persist even after the male develops more masculine features such as testicles and a scrotum.
While the make nipple serves no purpose it can be a source of irritation. Protruding nipples can be a source of embarrassment both in and out of shirts and can also end up irritated and sore due to abrasion on clothing. I recently watched the end of the Indianapolis marathon and saw several men who had actual blood on their shirts from chronic nipple irritation that eventually caused them to bleed. I would imagine it would take days for such nipple ‘sores’ to eventually heal and become non-tender.


Dr. Barry Eppley
Indianapolis, Indiana

