Hi - I am a 47 year old male. For a few weeks, my left nipple has been a bit sensitive - it bothers me most when I wear heavier shirts, coats, etc. I have no pain in my breast and I can feel no lumps in or near the breast. There is also no discharge, itching, or rash, and the nipple looks pretty much like my other nipple that is not sensitive. I don t run, but do work out, but I don t believe it is related to working out. I was taking Propecia, but stopped several weeks ago.