In the 2026 suction-assisted subcision trial, both physician ratings and patient ratings favored the suction side. The trial enrolled only 27 people with bilateral atrophic acne scars, so the finding is narrow.
Subcision is a procedure that releases tight tissue under depressed scars with a cannula. Atrophic acne scars are depressed facial scars that sit below surrounding skin. The split-face design treated one side with subcision alone and the other with subcision plus suction.
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 27-person trial tested
- Where doctors and patients agreed
- Why 27 patients limits certainty
- Is 10 suction sessions worth it
What the 27-person trial tested
The trial used a randomized, split-face, patient-blinded design in 27 patients with scars on both sides. The U.S. National Library of Medicine PubMed record describes cannula subcision on both sides trial record.
One randomly assigned side received 10 suction sessions over 2 weeks, while the other received sham pressure. Both subcision alone and suction-assisted subcision improved scars from baseline. The split-face setup controls for skin type, age, and healing between people. It isolates the added effect of suction.
Where doctors and patients agreed
The PubMed record reports physician-rated Acne Scar Improvement Grading Scale scores were higher on the suction side (p=.002). Patient-rated scores on the same scale were also higher on the suction side (p=.026). Investigators concluded subjective assessments favored suction-assisted subcision.
They suggested the benefit patients notice is not fully captured by objective scar-counting methods. Objective scores reflect what a trained observer measures. Patient scores reflect what the person sees in the mirror.
Why 27 patients limits certainty
An earlier split-face rater-blinded trial found no persistent dermatologist-measured difference. Patient-assessed improvement favored suction at 1 month (37% vs 24%, p=0.04). The advantage was gone at 4 months, as reported in the Research Square preprint full preprint text.
Cochrane's acne-scar review found no high-quality evidence to determine subcision effects or safety. It cited few participants, imprecise results, and lack of blinding. That warning limits how far readers should stretch results from 27 people, according to the Cochrane Library Cochrane acne-scar review.
Is 10 suction sessions worth it
For people with scars on both sides, the trade is 10 suction visits for a mainly patient-perceived gain. Set realistic expectations about longer-term reduction, since durability is uncertain. Compare burden, gain, and durability before booking: Bring photos in consistent light and ask how your scar depth and healing pattern compare with the trial patients.
- Visit load: 10 suction sessions in 2 weeks on top of subcision
- Likely gain: better doctor score and better self-rating in the small trial
- Durability limit: earlier patient advantage faded by 4 months
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