My belly button is darker then my actual skin tone. How can I just lighten that area?

I always scrub it and I%26#039;ve used cocoa butter creme but nothing seems to lighten it. Its always been darker basically all my life and it doesn%26#039;t bother me as much but i would prefer for my skin tone to be even because a dark belly button isn%26#039;t too cute.|||Lemmon juice is a natural skin lightener. Just put some on a cotton ball and rub it on the area you want lightened every night.