Published research has suggested to keep sessions at least 3 weeks apart.
Personally, I keep the sessions at least 1 month apart for best results. This is to ensure that there is adequate recovery time, especially if i use a combination of Subcision, Fractional CO2 Laser and Fillers during the treatment session.
For more information on Acne scar treatment costs including subcision costs.
Hope that this helps!
Warmest regards,
Dr Justin Boey