I am 5 8, I weigh 129, and I am 17 years old. I recently started being sexually active, and I have had people in my family with cancer. For example, my grandmother on my dads side has breast cancer . My grandfather has skin cancer on the same side. In the past 3 days, I have noticed my nipple on my left breast has been sore, and feels like dry skin is on it. It s rough. Is this a possibility of cancer?