Longer follow-up must show whether smoother skin lasts, whether dents return, and whether dark marks fade or stay in people with atrophic acne scars. Atrophic acne scars are dents left when severe acne destroys collagen and skin heals below the surface.
Early results favor radiofrequency microneedling for comfort and recovery, but lasting repair is still unproven. Li and colleagues enrolled 33 patients with facial dents in a prospective randomized split-face evaluator-blinded trial. Thirty completed the comparison of radiofrequency microneedling versus fractional CO2 laser, according to the PubMed abstract record.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What did the 33-patient split-face trial find?
- Why doesn't early comfort settle the choice?
- Does scar shape or skin tone change the fit?
- What must longer follow-up prove before you decide?
What did the 33-patient split-face trial find?
Each patient received radiofrequency microneedling on one cheek and fractional CO2 laser on the other. Radiofrequency microneedling pairs tiny needles with heat to trigger collagen below the surface. Fractional CO2 laser removes tiny columns of surface skin to drive deeper remodeling. In that Li trial, radiofrequency microneedling earned higher efficacy satisfaction after the first session.
It also earned higher safety satisfaction at every follow-up check. Faster healing drove much of that early preference. The same trial linked radiofrequency microneedling with faster recovery and fewer pigmentary events. That matters for people whose acne marks often turn dark and linger. Safety satisfaction stayed higher for microneedling across follow-up.
Why doesn't early comfort settle the choice?
Short trials reward fast healing and less redness. Deeper scar remodeling can take months and may favor a stronger resurfacing injury. One early score cannot capture both paths. A March 2026 meta-analysis of 8 randomized trials with 249 patients found fractional CO2 laser superior for scar remodeling and patient satisfaction, according to the Wiley meta-analysis.
The Likert satisfaction gap was small but significant, with a mean difference of 0.32. That analysis measured Goodman-Baron or ECCA severity, satisfaction, and harms such as hyperpigmentation, redness, pain, and downtime. The message is split rather than simple. Microneedling won early comfort in the 33-patient trial, while pooled longer data favored CO2 for remodeling. A reader needs both time frames before choosing.
Does scar shape or skin tone change the fit?
Both methods improve depressed scars, but they do not suit the same dents equally. A DOAJ-indexed comparative study reported fractional microneedle radiofrequency fit M-type scars better. The same study linked ultra-pulsed CO2 with better response in V-shaped scars. Skin prone to discoloration shifts the balance further.
The Wiley authors urged caution in patients prone to hyperpigmentation. The Li investigators also saw fewer pigmentary events with radiofrequency microneedling. CO2 brought more skin reactions and longer healing in the scar-shape comparison. For medium and deeper skin tones, longer redness and brown marks can outweigh a small remodeling edge. Scar shape, prior dark marks, and available downtime deserve direct discussion.
What must longer follow-up prove before you decide?
Durable proof is still missing. Cochrane found no high-quality long-term acne-scar evidence, with the longest follow-up only 48 weeks, according to the Cochrane review. Longer studies must track lasting remodeling, recurrence, and persistent pigmentation with standard scales such as Goodman-Baron or ECCA.
Safety also needs longer, clinic-level tracking. On Oct. 15, 2025, FDA warned that certain radiofrequency microneedling uses caused burns, scarring, fat loss, disfigurement, and nerve damage, according to the FDA safety communication. Some injuries required surgery, and FDA stressed that the treatment is a medical procedure.
- Ask which scar types you have and which device fits them
- Ask expected downtime, redness, pain, and dark-mark risk for your skin
- Ask who performs the procedure, what training they hold, and how harms are handled
- Bring dated photos and a list of prior dark marks to your visit
You Might Also Like
- Subcision With Suction for Acne Scars in a 2026 Split-Face Trial: What Longer Follow-Up Must Show for People With Rolling Acne Scars
- Objective vs Patient-Rated Results in the 2026 Subcision Trial: What Longer Follow-Up Must Show for People With Rolling Acne Scars
- The 160-Participant Acne Scar Combination Trial Published in 2026: What the Trial Means for People With Boxcar Acne Scars