Microneedling for Acne Scars
This article is for the reader with acne scars who is weighing microneedling against other routes. It follows what two published sources say, then marks where a messy case needs more than either one gives.
What dermatologists say it is used for
The American Academy of Dermatology describes microneedling this way: "This cosmetic treatment is often used to treat acne scars, scars caused by an injury, and surgical scars."

Acne scars appear in that list beside two other scar types. Your own scars may not match any one of them cleanly.
When filler enters the scar conversation
Microneedling is not the only route people compare for the same scars. A review on PubMed Central (NIH), Dermal Fillers in the Treatment of Acne Scars: A Review, takes the filler route.
Choosing between the two routes is a competing-priority problem. The review and the dermatologists' page each cover only their own side of it.
Reading the procedure page
The American Society for Dermatologic Surgery keeps a page on microneedling. Read it for the procedure itself, then set it against your own scarring.
What to raise with a clinician
Bring photos of your scars and a list of what you have already tried. Ask which of the two routes fits your scars, and whether Westchester timing, such as an event date, changes the order.