In the 2026 split-face trial, suction-assisted subcision outscored subcision alone on both doctor ratings and patient ratings for atrophic acne scars. Subcision is a treatment that releases tight fibers pulling depressed scars down, and suction adds gentle vacuum to stop early re-sticking.
Both sides improved from baseline, so adults with depressed scars gained benefit in either arm. The trial compared subcision alone against suction-assisted subcision to test whether added suction prevents early re-tethering, according to the U.S. National Library of Medicine PubMed trial summary.
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
- How did doctors score improvement?
- What did patients see in the mirror?
- Why does blinded scar counting tell a different story?
- What should you ask before booking subcision?
How did doctors score improvement?
Physician-rated Acne Scar Improvement Grading Scale scores were significantly higher on the suction-treated side, p=.002. The finding was reported in Wolters Kluwer Dermatologic Surgery via Ovid October 2026 issue.
In practice, that means trained eyes saw smoother contour and greater overall change where suction was added. The scale reflects judged improvement, not just lesion number. For readers, it points to visible surface change rather than a cure for every pit.
What did patients see in the mirror?
Patient-rated Acne Scar Improvement Grading Scale scores were also significantly higher on the suction-treated side, p=.026, as reported in Wolters Kluwer Dermatologic Surgery via Ovid. Patients perceived greater improvement with suction.
That match matters because daily life runs on mirror checks, makeup, photos, and side light. The authors concluded subjective assessments favored suction-assisted subcision, suggesting clinically clear contour benefits not fully captured by objective scar-counting methods, according to the U.S. National Library of Medicine PubMed.
Why does blinded scar counting tell a different story?
An important limit comes from the related Northwestern split-face, rater-blinded trial in adults with bilateral scars. Blinded dermatologists found no arm difference at 1 and 4 months on validated severity and improvement scales across 28 areas and 154 treatments, according to the Research Square preprint full preprint.
In that cohort, mean patient-assessed improvement favored suction at 1 month, 37% versus 24% for subcision alone, p=0.04, but not at 4 months, p=0.37. Satisfaction and preference still favored suction, according to the Springer Archives of Dermatological Research report summarized by the ICH GCP registry. Counts can stay close while smoothness looks better.
What should you ask before booking subcision?
People with atrophic acne scars considering subcision should ask about suction as an add-on for visible smoothness while expecting scar counts to look similar, according to the Research Square preprint. Scar number and surface smoothness are different goals. Clarify timing, bruising, and durability in the same visit before you agree to treatment.
- Ask if suction suits your scar pattern and healing history
- Ask when suction starts, how it is applied, and for how long
- Ask about bruising, aftercare, and how long smoothness may last
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