What can I do about my dark spots ?

I have dark spots around my armpits, On my neck (where I usually get eczema), In the creases of my arms(also where my eczema comes and goes), On the back of my knees, on my back and under my buttocks(the worse one), and in between my legs. Is there anything that I can do to get rid of the uneven skin tone that is all over my body? I also have a lot of back acne, and it leaves spots once gone.

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