Suggest Treatment For Hyper Pigmentation On Buttocks And Waist?

Hello Doctor, My skin is very dark near my butt and inner thighs compared to my rest of the body. my butt becomes dry most of the time. i could also see lot of dead skins on my butt and black marks on my waist. i think this dark mark on my waist is because of wearing tight pants. i apply moisturizer on my butt and waist when it becomes dry. How can i get rid of this dark skin on my butt and my waist? i am 24yrs female