Microneedling can help diminish acne scars, according to the AAD, so ask your dermatologist about a series of treatments rather than a single visit.
What the AAD says about the effect
The AAD puts the mechanism in one sentence:
Also called “collagen induction therapy,” the new collagen helps diminish acne scars.
In plain words, microneedling prompts new collagen, and that new collagen is what the AAD credits with diminishing acne scars.
How many visits
The AAD gives a worked example for scars: If your dermatologist is treating acne scars, you may need three to five treatments, which are performed every two to four weeks. The restatement is simple. Plan for several visits, spaced a few weeks apart, and expect your dermatologist to set the exact count.
Planning your visits
Bring a photo of the scars you want treated to your St. Augustine dermatologist and ask how many treatments they would plan and how far apart. For wider reading, see a PMC review of acne treatments and a PMC article on acne scar pathogenesis, classification and treatment.