I'm 19, African and bronze in complexion. My skin is very dull and uneven. How do I get an even lighter skin tone?

My skin looks very dull and uneven. At the level of my back is worst.were i have parts dat r lighter dan my back itself which consist of small white spots on it lyk eczema.it gets worse wen i use oil.i have been using couple of oils such as fair and balance, fair and white (gold) and currently fair and white (so white)hydrating cream which i mix argan oil it.my question is what body lotion with uv protection can i use to even my skin tone? What can i use to ger rid of the white marks on my back

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