The 2026 Li et al. split-face trial found both treatments improved atrophic acne scars, but the radiofrequency microneedling side had faster recovery and fewer pigmentary events. People with rolling scars — shallow, wide depressions without sharp edges — should not read that average win as proof of permanent removal for their subtype.
The trial compared radiofrequency microneedling to fractional carbon-dioxide laser in the same patients, published in the Journal of Dermatological Treatment, according to the U.S. National Library of Medicine PubMed abstract. The authors called it an exploratory split-face sample, so it measures side-to-side differences within a person rather than lasting clearance for all rolling-scar patients.
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 trial compare?
- Why can a headline average mislead rolling scars?
- Which recovery and pigment trade-offs matter?
- What should you do before and during healing?
What did the trial compare?
Radiofrequency microneedling uses tiny needles plus heat in the dermis to stimulate repair with less surface ablation. Fractional carbon-dioxide laser removes microscopic columns of surface skin to drive remodeling. In this design, one cheek received one method and the other cheek received the other.
Both sides improved. The microneedling side showed higher safety satisfaction at all follow-ups and higher efficacy satisfaction after the first session. Faster healing drove much of that early preference gap.
Why can a headline average mislead rolling scars?
Rolling scars are broad and shallow without sharp borders, one atrophic subtype alongside deeper boxcar and narrow icepick scars, according to MDedge dermatology reporting. Boxcar edges and icepick depth respond differently to resurfacing and collagen stimulation. A combined scar score can therefore hide subtype-specific response.
A split-face average also blends skin tones, scar age, and prior treatment. Darker skin carries higher post-inflammatory hyperpigmentation risk after aggressive resurfacing. Readers with mainly rolling scars need subtype results, photos by scar type, and follow-up length before assuming the same outcome.
Which recovery and pigment trade-offs matter?
Downtime means redness, swelling, crusting, and days away from makeup, work photos, or sun exposure. Pigment events mean new brown marks or light spots that can outlast redness. For many patients, avoiding those marks matters more than gaining slightly faster smoothing.
A 2026 meta-analysis of randomized trials advises caution offering CO2 laser to hyperpigmentation-prone patients or those with low pain and downtime tolerance, despite potentially faster pronounced results, according to the Wiley Journal of Cosmetic Dermatology analysis. An earlier single-treatment split-face trial also reported less downtime and less hyperpigmentation in darker shades with microneedle radiofrequency. Ask your clinician where you fall on pigment risk, pain tolerance, and time off.
What should you do before and during healing?
Use the visit to translate the headline into a personal plan. Bring a scar map, pigment history, and healing calendar.
During healing, use daily broad-spectrum SPF 30+ and strict sun avoidance because ultraviolet exposure darkens scars and raises hyperpigmentation risk after resurfacing, according to the Eve Clinics specialist guide. Keep the area clean, avoid picking crusts, and report spreading redness, blistering, or pigment streaks promptly.
- Ask: are my scars mostly rolling, mixed, or tethered, and does that change device choice?
- Ask: do I need subcision, filler, or staged treatment rather than resurfacing alone?
- Ask: what pigment precautions apply to my skin tone and sun exposure?
- Ask: how many days of redness, peeling, and sun avoidance should I expect?
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