How to remove sundamaged skin?

I want to know how to get rid of the darkened skin on my arms and shoulder ect. naturally. My skin got this way because during the summer last year I participated in Marching Band Camp all last summer which involved numerous hours in heat causing me to be much darker... I used to be Keke Palmer's complexion but now I am a little brighter than Kelly Rowland. I am african american if that helps. If you can recommend skin creams and products that you can buy in a store if recommended by a doctor.