Retinol and Niacinamide work to control acne and can treat superficial pigmentation. Pitted acne scars can be treated using the methods that Dr Chin has described above.
It does look like you have some rolling scars as well and this is best treated with subcision, with or without dermal filler placement.
Subcision works by manually freeing up the scarring that is tethering/ pulling the skin down.
Subcision can be combined with the above mentioned energy based treatments. Acne scars are best treated with a variety of methods depending on the type of scarring, skin type and downtime.
wishing you all the best in your journey!
Regards
Dr Mark Lim