What can be done to lighten discoloration as a side effect of CoolSculpting done a year ago? (Photos)

I have had coolsculpting done a year ago. I was left with a round ring discoloration from the pad of the applicator. Anyway, I have had 3 treatments of microneedling done on the area and two treatments of laser tattoo removal. I have also been using hydroquinone 8% for months that was prescribed to me from my dermatologist. Nothing has seemed to help to lighten the hyperpigmentation. Any suggestions of what approach to take next would be appreciated?!