Hyperpigmentation from laser resurfacing for sunspots. How can I undo it?

I had laser resurfacing with Gentlemax machine done on a few sunspots. The first treatment I had great results but last treatment I got burned and it has left me with hyperpigmentation. It is fading but very slowly. I am using hydroquinone but it irritates my skin. Is it safe to have the laser done on very low conservative to remove Hyperpigmentation? What about by same person since they know previous settings used? I am a Fitzpatrick 4 (burn but tan). Alexandrite setting was used.

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