In the 2026 split-face trial, radiofrequency microneedling (RFMN) healed faster and caused fewer pigment changes than fractional CO2 laser (FCO2), with higher safety satisfaction. The finding comes from about 30 completed split-face comparisons, so it guides but does not settle care for rolling scars. Rolling scars are wide, shallow dips with sloped edges that create wavy texture. Split-face means one cheek received RFMN, tiny needles plus heat, while the other received FCO2, laser dots that remove surface columns.
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 30-person trial tested
- What faster healing means for pigment risk
- Why rolling scars fall outside the proof
- How to use these limits at your visit
What the 30-person trial tested
The 2026 trial tested RFMN against FCO2 for facial atrophic scars in a prospective randomized split-face evaluator-blinded study. The U.S.
National Library of Medicine lists 33 enrolled patients and 30 completers in the 2026 trial record. The PubMed abstract reports improvement with both treatments, so neither arm failed. It also reports faster recovery, fewer pigmentary events, higher safety satisfaction, and higher first-session efficacy satisfaction with RFMN.
What faster healing means for pigment risk
Post-inflammatory darkening and longer redness drive most downtime worry. A 2026 systematic review in Springer Lasers in Medical Science compared fractional CO2 with microneedling.
It found similar efficacy but more hyperpigmentation and downtime with CO2, favoring RF-based recovery, as detailed in the systematic review analysis. For pigment-prone skin, fewer darkening events can matter more than a small efficacy gap. Shorter healing cuts cover-up time, sun-care burden, and time off work or school.
Why rolling scars fall outside the proof
The split-face finding reflects one treatment session, not a full course. The ResearchGate record describes a randomized single-treatment split-face design in the single-treatment trial page. Rolling scars often receive staged sessions, so one round cannot predict final texture. A December 2024 Research Square preprint tested multiple subcisions for bilateral rolling scars in only five patients.
Its authors calculated 19 patients for adequate power, leaving the improvement signal 14 subjects short. Wiley Dermatologic Surgery Sardana et al. reported that boxcar scars improved more than rolling and icepick scars after four nonablative laser sessions. Only boxcar change reached statistical significance, which warns against applying mixed-scar averages to rolling texture.
How to use these limits at your visit
Ask for scar mapping before choosing energy, plus a session plan and pigment plan. Rolling texture, session count, and skin tone change the balance between RFMN and FCO2. Bring dated photos in the same light to show rolling shadows, healing time, and any darkening after each session.
- Confirm your scar mix is mapped as rolling, boxcar, or icepick before choosing energy
- Ask how many sessions the plan includes and how pigment risk is monitored
- Ask what downtime and sun protection each option requires for your skin tone
You Might Also Like
- Recovery and Pigment Safety in the 2026 Split-Face Acne Scar Trial: What the Trial Means for People With Rolling Acne Scars
- Subcision With Suction for Acne Scars in a 2026 Split-Face Trial: Sample Size and Evidence Limits for People With Atrophic Acne Scars
- The 160-Participant Acne Scar Combination Trial Published in 2026: Sample Size and Evidence Limits for People With Atrophic Acne Scars