Hello, I am a 29 year old male. About a month ago I noticed a lump directly behind my right nipple. Some days it's tender, others it's just there. Could this be swollen lymph node? Symptom of
Std? I've been lifting weights for 3 months (no supplements) ... could that have something to do with it? Sometimes my nipple feels irritated and hurts when my shirt brushes against it.
Thanks for your help