The 2026 33-patient split-face trial found both radiofrequency microneedling and fractional CO2 laser improved atrophic acne scars, depressed pits left after acne heals. People with atrophic scars can avoid overreading the headline by treating it as one small comparison, not a final winner. Radiofrequency microneedling delivers heat through tiny needles. Fractional CO2 laser removes microscopic columns of skin to trigger remodeling.
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 the 33-patient trial compared
- What larger pooled results show
- Why scar shape and skin tone matter
- How to use these results at your appointment
What the 33-patient trial compared
The U.S. National Library of Medicine PubMed record describes a 2026 prospective randomized split-face evaluator-blinded exploratory trial the PubMed record. It enrolled 33 patients with facial atrophic scars and 30 completed treatment. One side of the face received radiofrequency microneedling and the other received fractional CO2 laser.
The PubMed abstract concludes both approaches improved scars. A headline that declares one failed misreads that result. The sample was small and exploratory. It used a single treatment per side, so it cannot prove long-term or multi-session effects for most patients.
What larger pooled results show
A March 12, 2026 meta-analysis by Argobi et al. in the Journal of Cosmetic Dermatology pooled 8 randomized trials with 249 patients the Wiley meta-analysis.
It found fractional CO2 laser superior for scar remodeling, with Likert satisfaction higher by mean difference 0.32, p=0.005. The same Wiley analysis found greater procedural pain, higher post-inflammatory hyperpigmentation risk, and longer redness recovery with CO2 than with microneedling radiofrequency. That tradeoff explains why stronger remodeling does not mean better for everyone.
Why scar shape and skin tone matter
Atrophic scars include icepick, boxcar, and rolling subtypes. The DOAJ-indexed comparative therapeutics study reported microneedle radiofrequency worked better for M-type scars while CO2 worked better for V-shaped scars the comparative study.
Pigment risk deserves extra attention with darker skin. A retrospective cohort from Universitas Airlangga reported hyperpigmentation in 59.5%, crusts in 26.2%, and prolonged redness in 19%, with higher effects in darker skin the cohort report.
How to use these results at your appointment
If you get dark marks easily or cannot take downtime, CO2's stronger gain comes with longer recovery. If pain tolerance is low, radiofrequency microneedling may be easier to complete.
Bring these points to a dermatologist who sees your scar and skin type. Ask which subtype dominates and what pigment precautions apply. Choose scar-type and skin-type treatment with a dermatologist, weighing CO2's faster pronounced gain against longer recovery.
- scar subtype, especially M-type versus V-shaped areas
- pigment history, current tone, and sun exposure
- pain limits, downtime, and number of planned sessions
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