As I was in the shower today, I went to take my loofa over my left breast and i noticed a very small black dot in my nipple. It kind of looked like a very tiny drop of dried blood. It took me about 10 minutes to finally scratch it off. This has never happened to me before, so I'm kind of freaked out right now. I googled it, and I found a website and the same thing has happened to many women, and their doctors don't even know what it is. Has this happened to any one here? Did you ever figure out what caused it?