What treatment can I use for skin pigmentation caused by sun damage on outer thigh? (photos)

I have brown spots on my outer thigh due to sun damage I have gone to a dermatologist and did a biopsy. It started as a very small spot when I was 12 now I'm 26 and it has gradually spread I've done IpL and chemical peels. I want to find something that will take care of the problem without having to do multiple treatments please help!

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