Almost a week ago my boyfriend and I were having sex and he began to squeeze my nipple. It started to really hurt so I told him to start, but the next day my nipple was so sore. It stopped hurting the next day so I didn't even think more about it. Yesterday, which would make it about 4 days after it got irritated, I looked down at my nipple and it is swollen and almost looks like a scab next to the nipple. Is this normal??