Hi. I have a 15 month old child and when I was breastfeeding I developed what I assumed was a blood blister on my nipple. It is a little black mark which appeared from no-where. After 6 months of it being there I saw the doctor who referred me to a dermatologist. She had a look and said it is not a blood blister, but would like to get a second opinion, so I am currently (5 weeks later) waiting for another appointment with a different dermatologist. The dermatologist mentioned skin cancer, and breast surgery, but I think it was more a case of letting me know the worst so I would be prepared just incase. However, I also have 2 lumps in my armpit which I didn't even think to mention about. One which has been there about 8 months, and the other which has developed recently. They're not painful and they're not huge, but they're definately there. I have just in the past week stopped breastfeeding and so I am assuming the pain in my breast with the mark is down to a blocked duct or mastitis which will clear soon enough.