The other day I was having sore breasts like I do every time of the month. I was doing a breast exam when I found a medium sized lump right below my nipple, on my right breast. Could this be from the fibrocystic thing? I never have noticed it before but it's very noticable. I am just wondering if this could be what my mom had, just a fluid filled cyst, and when should I go to the doctors? I am going to wait and see if it goes away after my cycle is over, and then if not what do I do?