I'm 16 years old, and I had this problem going on for about 1 year now. Last year my nipple started to open up and I know I'm not pregnant cause I just went 2 months ago I got a pregnancy test done due to a sickness I had. But there is white gooey stuff coming out my nipple at first I was scared but then I found out I wasn't pregnant I was good. So now I'm kind of wondering what's the cause of this. ANY SUGGESTIONS ON WHAT IT MIGHT BE ?