Have white skins around anus - it itches but don't know what it is

I noticed about a month ago what felt like a bump around my anus - when I looked at it - it was not really a bump but an area of white skin. The harness of the bump has gone away, but the white area is still there. It isn't painful, but is sometime itchy, especially if I sit for a long time or am hot and sweaty. I have in the past had painful swelling in the same area - but it usually goes away quickly. I've never notice the color change before though. I've looked at pictures of warts and it doesn't look like anything I've seen pictures of but I'm not sure. I've tried to compare it to hemorrhoids pictures as well and doesn't look like that either. So I'm not sure what's going on. Has anyone seen anything like this before?