I'm aged 20, male and have had a 1inch (in diameter) mass under my nipple for about 2 months, it's quite firm, and doesn't hurt unless I fiddle with it a lot.
I had something very similar about 2 and a half years in one of my nipples (can't remember which one), I didn't think much of it at the time but I think it went away within about 2-3 months.
After doing a little google search, it seems it's probably gynecomastia which is common in teenagers.
Any advice please?
Will be seeing a doctor about it soon. Lumps in your breast are not to be taken so lightly get you self to a doctor. You are young but Cancer does not care. I also have same on my left breast (gynecomastia) during my teens up to my early twenties and consulted a doctor about it. He injected me with a testosterone and later on it was gone | 