How to Treat Hyperpimentation from Sunburn?

I am a 25-year-old male and have a hyperpigmentation question. About a year ago, I ended up lying down in the sun and placed a towel over my head that covered part of my upper back, which i was unaware of. I ended up falling asleep and burned half of my back since i had no sunscreen on. Now I still have two skin tones on my back and it really bothers me. I have been told 8% hydriquione would work on the area, but also was wondering if a Chemical peel would put that area back to normal coloring. Please help and let me know what I should do. Thanks!