I was also born with a third nipple under my left breast. When I was very young my mother always told me that it was a birthmark, but in later years doctors told me what it was. In early days a third nipple under the left breast was supposed to be a sign of a witch.
I also have a birthmark in the middle of my forehead that is just a faint pink rash-like mark but becomes very red when I am angry or upset. I believe in reincarnation and have had many indications of past lives.