Hypopigmented scarring extremely unusual for Fractionated Laser

I began Fraxel about a year ago. I think I had 7 treatments all up for chicken pox scars. The first treatment went fine, however the 2nd was very painful and just 1 hour later, I had big blisters where the treatments had been done. I was swollen and I developed dark red scabs and was very red for months. A year later, I now have a big, white rectangular area on my cheek. I saw a dermatologist who advised that sun will get rid of this. It hasn't. Will this mark ever go? It is very noticeable.