CO2 on darker skin

Hi, I see a lot of posts about using CO2, presumably fractional, for acne scars on darker skin people. At the energies needed for results, I’m surprised I’m not hearing of hyperpigmentation as a side effect here, even with using a lightening cream before/after treatment. Is this a thing or just over-exaggerated side effect? I know posts are just single experiences but just trying to get more input here. Thanks!