Longer follow-up for people with atrophic acne scars — pitted scars left when skin heals with too little collagen — must track lasting scar smoothing, delayed or returning dark marks, and satisfaction by scar type. In the 2026 prospective randomized split-face trial, both radiofrequency microneedling and fractional carbon dioxide laser improved facial scars, but radiofrequency microneedling showed faster recovery, fewer pigmentary events, and higher safety satisfaction. Split-face means one side of the face received one treatment and the other side received the other treatment.
The trial is identified by the JMIR Derma citation record as Li et al. in Journal of Dermatological Treatment 2026;37(1) JMIR Derma citation record. That design allows a direct comparison in the same person.
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 each side of the face show?
- Why do healing time and color risk differ?
- What must longer follow-up track?
- How can you use this result before treatment?
What did each side of the face show?
Both treatments improved facial atrophic acne scars in this exploratory split-face sample. The U.S. National Library of Medicine PubMed abstract reports efficacy on both face sides rather than benefit from only one method U.S. National Library of Medicine PubMed abstract. The same abstract reports faster recovery and fewer pigmentary events with radiofrequency microneedling.
It also reports higher safety satisfaction at all follow-up assessments with radiofrequency microneedling. Efficacy satisfaction was higher after the first session with radiofrequency microneedling. For readers, the pattern is practical. Both options helped scars. The recovery and color-change burden favored radiofrequency microneedling in early follow-up.
Why do healing time and color risk differ?
Ablative fractional carbon dioxide laser improves atrophic scars by removing damaged surface tissue and tightening underlying collagen. The Wiley article in Journal of Cosmetic Dermatology explains that this action commonly causes redness, color change, visible small vessels, and lengthy recovery that affects quality of life Wiley article in Journal of Cosmetic Dermatology. Redness means skin stays pink or red for days to weeks.
Dyspigmentation means dark or light marks appear where inflammation occurred. Telangiectasia means tiny surface vessels become visible. These effects matter because downtime affects work, school, and makeup use. Color changes matter more when they last weeks and show on the central face.
What must longer follow-up track?
The key limit is small exploratory single-treatment split-face design with short follow-up. The ResearchGate record of the single-treatment split-face trial notes that longer follow-up must track durable scar remodeling, delayed or recurrent dark marks, and satisfaction by scar subtype ResearchGate trial record. Durable remodeling means pits stay smoother after swelling fades. Delayed dark marks mean pigment appears after the first weeks.
Recurrent marks mean color fades, then returns with sun or irritation. Results by scar subtype mean outcomes are sorted by pit shape and depth. One method may suit shallow wide pits better than deep narrow pits. Longer tracking should separate those answers.
How can you use this result before treatment?
Ask how your clinician defines success for your scars. Ask what healing looked like for patients with your skin tone.
Ask how many sessions are planned and how progress will be photographed. Bring these checks to your visit: Choose the option whose downtime, pigment profile, and follow-up plan fit your schedule and skin. Keep sun protection, gentle cleansing, and scheduled reviews as instructed by your clinic.
- What is my scar pattern, and which side of the evidence fits it best
- How many days of redness, peeling, and makeup limits should I expect
- What is my personal risk for dark or light marks, and how are they treated
- When will we review photos and decide about another session
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