I know it's very rare for women under the age of 20 to get breast cancer but I'm worried nonetheless. I don't know how long the lump/bump/pimple thing has been there but recently I've been getting worried about the painless, tiny round bump just under my left nipple. It's the same color as the aereola. It's the only one I've noticed and I'm 18 and have recently found out I'm also pregnant. I haven't noticed any other symptoms involving it so I'm quite concerned, especially after all the online research I've done.