I'm 19 years old and about 9 months ago I found a hard pea size ball under my areola. It doesn't move and it hasn't changed size yet, at least I can't tell if it has. It also does not hurt at all. About 2 years ago I noticed a birthmark appeared out of nowhere right I between my breasts and I'm wondering if that has anything to do with it. I have gained quite a bit of weight in the past year due to a low thyroid condition and I am wondering if it may have something to do with this as well.
Let me know what you think.