I just recently noticed yesterday I had a small lump right Under my nipple and today it got bigger since yesterday and it's a little sore and it hurts when I push down on it. I can tell now one of my boobs are bigger than the other the lump is the size of a quarter and is pretty thick. Don't know what it is but 2 years ago I had a thing that is similar I had to go on antibiotics for it don't know of it is the same thing but would like your opinion. I would ask my mom but she's not feeling well right now and I have no one else to ask.