I'm a little disgusted that I know this, but there is such a thing as anal bleaching. I certainly wouldn't recommend doing it yourself, if this is what your heart is set on doing. Seek out a pro on such issues. Call a spa and ask them. I'm sure they will know what you are talking about.
I know we all have our own insecurities, but my advice to you is that unless you take graphic nude photos or star in porn, please don't worry about your dark crevices. Obviously, you are absolutely entitled to do whatever you please, but women with our condition have so many other things to be insecure about. I recommend choosing one of those other things to worry about instead.
I only mean it with love.
