Sorry to hear that you are troubled with post acne red marks. Laser is indeed the best way of removing these marks.
We usually use the pulsed dye laser (VBEAM) as it is excellent in shutting down the blood vessels and resulting in fading even after 1-3 sessions.
In terms of topicals, we usually advise patients to practice strict sun protection and apply sunscreen daily as well as to reduce sun exposure as much as possible. As long as there are no new active acne forming, these marks will usually fade gradually over time.
Hope this helps!
Warm regards
Dr Stephanie Ho, Dermatologist