I am kind of worried about my ?

I am not really positive how long I have had this, I know it is a while though. I have stuff growing on my nipple. My /nipple doesn't hurt or anything. When I try to pull it out, it really hurts. I have gotten a little bit off and it is a gummy type texture. I don't know what it is. I am a virgin. Could it be a yeast infection or fungi?