A 2026 split-face trial tested subcision, which releases fibers pulling scars down, plus suction in 27 people with atrophic scars the 2026 trial record. Added suction improved satisfaction scores but did not prove extra scar removal in this small 4-month study. Atrophic scars are depressed scars left after acne heals. Readers considering subcision need to know what suction adds, who benefits most, and what burden it requires.
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 researchers test suction?
- What got better — and what did not?
- Who is this evidence for?
- Are 10 extra sessions worth it?
How did researchers test suction?
Both cheeks received cannula subcision, so suction was the only difference. One randomly assigned side received 10 suction sessions over 2 weeks.
The other side received sham pressure for comparison. Doctors checked results at baseline, 1 month, and 4 months. They used Goodman and Baron Qualitative Grading, Modified Quantitative Global Scarring Grading, scar counts, and the Acne Scar Improvement Grading Scale.
What got better — and what did not?
Both sides improved after subcision. The U.S. National Library of Medicine PubMed record reports higher physician- and patient-rated improvement scores on the suction side, p=.002 and p=.026 the PubMed efficacy results.
Those scores reflect visible, felt benefit. Objective scar counts did not fully capture that gain, so authors limited claims of superior removal. A Research Square preprint of earlier split-face work found no dermatologist-rated difference at 1 or 4 months. Patients favored suction at 1 month only, 37% versus 24%, p=0.04, not at 4 months, p=0.37 the earlier split-face report.
Who is this evidence for?
This evidence concerns depressed atrophic scars. A Dermatology Paper review explains subcision releases fibrous tethers pulling skin down and helps rolling and tethered scars more than icepick scars the dermatology review.
Rolling scars look broad and wavy and often shift when skin is stretched. Icepick scars look narrow and deep and usually need a different approach. People with mainly tethered rolling scars match the tested treatment best.
Are 10 extra sessions worth it?
Suction meant 10 extra visits in 2 weeks for mainly subjective gain. The trial was small, with 27 patients and 4-month follow-up, so durability beyond that is uncertain.
Temporary bruising and pigment change add to the burden. Ask your dermatologist to show before-and-after photos for rolling scars and explain bruising, pigment risk, and follow-up timing before you commit.
- 10 suction sessions in 2 weeks plus healing time
- Likely gain is better look and satisfaction, not proven extra scar removal
- Possible bruising and pigment change, with uncertain benefit after 4 months
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