How to prevent future pigmentation for lighter skin tones after CO2RE laser? (Photo)

I did co2re laser 4 days ago to remove deep acne scars. Is this how the skin should be after one session? I'm really worried and scared that my skin becomes pigmented after the healing process, Is that possible? Can you please suggest possible ways to prevent future pigmentation as i only treated the affected areas of my skin not the entire face... Is it safe to do small areas of the face is it normal? Please advise?

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