This might be a little TMI, but I have this dark spot between my breasts that will not go away. Does anyone know what it is? I work out all the time & I am not over weight. I read someone said it could be fungus for sweating a lot. How do I get rid of it. Bikini season is here! & I really am embarrassed by it. Does anyone have anything like this! Please help me! Dermatologist said he didn't know what it was either. He didn't know how to get rid of it. He said it could be for sweating too much. Please help'