i have a hard bump-like thing under my right nipple. at first i thougt it was a premenstrual lump, but i am about 4-5 days into my period and it still is sore. if you touch my breast you can feel the lump, but you cant really tell unless you actually look really hard...my other breast looks fine so what might this be? is it breast cancer? i am scared if it may be? please help me! i am only 13 going on 14 and i thought it was rare in women my age! please help!