So there's been this sticky yellow discharge coming from my anus and it itchy too. theres so much of it! It doesn't come all the time but when it does it flows like water in small amounts. the whole length of my butt is usually wet which is annoying because now the skin keeps breaking and I have a huge cut down my butt. When the stuff dries it forms this kind of crust and just dries my skin. I also have like a tiny pink bump at the opening of my anus that didn't used to hurt but now it does. It does smell but it doesn't smell horrible, it's barely there. what could this be?

im a 16 year old girl, still a virgin.