Severely burned by IPL on my back. I have both hyper- and hypo-pigmentation. What can be done to remove these scars? (photos)

A month ago, I received IPL treatment on my back for acne scars. Instead, I came out with even worse scarring than I could ever imagine. I suffered from 1st and 2nd degree burns. For the first 2 weeks, I treated my burns with Vaseline and Neosporin, 2-3 times a day. After the scabs came off, I switched to Mederma and Bio Oil 2-3 times a day, but haven't really noticed any improvement. All summer, I've worn shirts that cover my back. What procedure can remove these scars?