Topical retinoic acid after picosure treatment. Is it ok?

Derm gave me a topical retinoic acid cream and tyrosinase cream for maintenance post my 1st picosure, started using the creams 3 days post 1 tx. I am having picosure due to a annoying atrophic scar which has darkened. 1st session it has lightened completely but darkened after 2 weeks. 2nd session, i had same result. Derm said hyperpigmentatiom clears up by layer? However, this just a PIH not a melasma... is there something wrong with my skincare regimen?

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