Subcision With Suction for Acne Scars in a 2026 Split-Face Trial: How People With Atrophic Acne Scars Can Avoid Overreading the Headline

Adding suction to subcision, a procedure that cuts tight bands under dented scars, beat subcision alone in a 2026 split-face trial. For people with atrophic acne scars, the safe takeaway is a small added benefit, not a guaranteed fix. Both sides improved.

Physician and patient improvement scores were higher on the suction side, according to the U.S. National Library of Medicine PubMed abstract PubMed abstract. That makes suction worth discussing, not worth demanding.

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.

What the new trial showed
Why ratings mattered more than scar counts
Why one headline is not enough
Who these results fit best
How to discuss suction with your dermatologist

What the new trial showed

The trial compared subcision on one side of the face with subcision plus suction on the other side. Each person served as their own comparison. Both approaches significantly improved atrophic scars in that trial population.

The suction side earned higher Acne Scar Improvement Grading Scale scores from physicians and patients. The reported differences were p=.002 for physician ratings and p=.026 for patient ratings. A p value under .05 is commonly treated as statistically significant.

Why ratings mattered more than scar counts

The trial authors concluded that subjective assessments favored suction-assisted subcision. They suggested the benefit was clinically perceptible but not fully captured by objective scar-counting methods. In plain terms, skin can look or feel better without losing many counted scars.

That distinction matters for expectations. Fewer deep shadows, softer edges, and smoother makeup application can matter to patients. A simple before-and-after scar count may miss those changes.

Why one headline is not enough

An earlier Northwestern University split-face, rater-blinded pilot found no dermatologist-rated difference between the two methods at 1 or 4 months, according to the Research Square preprint Research Square preprint. That pilot analyzed 28 treatment areas and 154 treatments.

Patients in that pilot reported more improvement with suction at 1 month, 37% versus 24%, but not at 4 months. The early perceived edge faded by month four. A short-term boost may therefore disappear with longer follow-up.

Who these results fit best

The results apply to adults with bilateral atrophic acne scars. A 2023 Clinical, Cosmetic and Investigational Dermatology review describes icepick, boxcar, and rolling subtypes. These subtypes respond differently to procedures.

That variation makes personal assessment important. Rolling scars with tethering may respond differently than narrow icepick scars. Scar mix, skin tone, healing history, and prior procedures all shape options.

How to discuss suction with your dermatologist

Subcision is invasive and needs a trained dermatologist plus sun-protective aftercare. Reported problems include bruising and bleeding, hematoma, prolonged redness, dark marks after inflammation, and infection, according to the complications review in PubMed Central complications review.

Ask whether your scars include tethered rolling-type depressions.
Bring clear photos in the same lighting, plus your scar and treatment history.
Ask about expected downtime, pigment-change risk, sun protection, and follow-up timing.
Do not try vacuum or suction tools at home to copy the result.