Hi, im 13 and a girl. Im worried , one of my breasts, my right one, is seeming to get different. My great grandmother had breast cancer, so I look out for these types of things. The shape of my nipple is changing, ive read that it could be a sign for breast cancer. Half of it is longer and more oval looking than the bottom, which is wide and circular. So it looks like 2 dent on each side to make it more clear, I just noticed it while doing a self evaluation.