What Causes Swelling In The Left Nipple Of A Man?
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Detailed Answer:
Hello and welcome,
This could be a number of different things, but must be checked in person by a doctor (and not a physicians assistant or nurse practitioner).
Men can develop lumps and enlargements in this area from hormonal imbalances but it can also be anything that can cause lumps or growths in other parts of the body including dermoid cysts and lipomas (benign).
However, in a very small number of men, it can be breast cancer. So this warrants an exam in person, and if the doctor doesn't know definitively that it is something specific that is a benign process just by looking at and palpating it, then an ultrasound (or sometimes a mammogram) is the next step. And the doctor may do a fine needle biopsy as well. Early detection is very important, so he should try to get the soonest appointment. If his doctor is booking out past more than a few weeks, ask to talk with his/her nurse and explain the situation as the nurse may try to squeeze him in sooner.
Statistically, this is most likely something benign, but the only way to know is to be seen in person.
I hope this information helps. Please let me know if I can provide further information.