How to lighten the dark butt cheek skin? Its like a dark vertical n broad strap.

[A0606]

I have heavy bottom..my skin of butt cheek is getting darker & darker..

[purple1234567]

There are some remedies people use to lighten skin in general, for example using lemon juice.  If you have skin randomly changing in pigment, it might not be a bad idea to have a doctor take a look at the changes, just to be a little more sure of the cause.  They can also help you with some other options for skin lightening that you may not have access to if you try to do it at home without a doctors guidance.