Will it take more than one laser acne scar treatment to diminish the scars on my face?

Ideally, one: Skin resurfacing with fractionated lasers attempts to balance between treating enough surface area to rejuvenate your skin and leaving untreated skin intact to hasten recovery. This requires fine tuning the treatment density and intensity to blend the scar. It is possible to spread a single treatment over several sessions, but this should be discussed ahead of time with your provider. Good luck.

Depends on modality: Laser treatments for acne can only soften the scars, but do not completely erase them. The non invasive lasers build collagen slowly, take multiple procedures and are costly. The more invasive treatments (ablative fractional resurfacing or full face ablative laser resurfacing with co2 or erbium laser) has both the abrasion affect as well as the collagen building benefit, but more down time.