Is it normal?

I posted this a little earlier and people were pretty rude about it. The area around my butthole is pretty dark (I'm very pale), I didn't really pay that much attention to it until someone pointed it out to me. After they pointed it out, my self esteem lowered because they obviously thought I was nasty (I'm a very clean person). Is it normal for the area to be really dark? Is there anyway that I can lighten it up some?