I noticed one day that on my vagina it had a white patch on it. I'm African American and I'm a virgin. The white patch is a bit like powdery like you can say. It's on the top of my vagina. When I wash down there it looks like it goes away but it's still there because the water jus makes it blends in( the whiteness goes away) but later on it comes back... Any advice on what it is or how I can treat it ?