Hyperpigmentation after chemical peel sun exposure. Will combination chemical peel or microdermabrasion help?

I had a chemical peel two years ago and the skin was flaking and it fell off while I was washing my face and then I had sun exposure without sun screen on a long drive and then dark patches started to appear on my face. I am using skin lightening agents and sun screen but none seem to work. Is it permanent hyperpigmentation? Is there any cure? Will combination chemical peel or microdermabrasion help? Please help, I am very concerned now.