Subcision is a minor procedure for tethered, depressed acne scars, where a needle slides horizontally under the skin to cut tight bands and free the scar. The best candidates have rolling scars and shallow tethered boxcar scars, downtime is usually about a week, and deeper or mixed scars often need combination treatment. Healing triggers collagen repair that helps lift the depression over time. Subcision alone usually gives mild-to-moderate improvement, so most patients need 2-4 sessions and added treatment to prevent re-tethering.
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 subcision frees a tethered scar
- Are you a good candidate?
- What does recovery involve?
- Why combine subcision with another treatment?
- Does needle or cannula matter?
How subcision frees a tethered scar
The Journal of Cutaneous and Aesthetic Surgery describes subcision as inserting a needle horizontally and sweeping it to cut fibrous bands under depressed scars technique summary. Cutting the bands releases the downward pull. The controlled injury then starts collagen repair.
Lift comes from both release and new collagen. The scar can still reattach during healing. That re-tethering is one reason subcision alone often gives only mild-to-moderate change.
Are you a good candidate?
The ASAP 2024 consensus identifies rolling scars and shallow tethered boxcar scars as the best targets for subcision consensus on scar types. These scars have a soft, bound-down base that can release and rise. Shallow edges respond better than sharp, deep pits.
Subcision alone is less effective for deep ice-pick scars, raised hypertrophic scars, or keloids. Those scars need a different approach. A clinician can map scar types across the cheeks, temples, and jawline.
- Good to discuss: rolling scars, shallow tethered boxcar scars
- Poor fit for subcision alone: deep ice-pick scars, raised scars, keloids
- Defer treatment with: active acne, skin infection, clotting disorder, poor wound healing
What does recovery involve?
Expect bruising, swelling, tenderness, and a firm lump or blood collection under the skin. Symptoms often peak within 72 hours. They largely resolve within about one week.
Many people return to work in 1-7 days, depending on bruising and job demands. A cheek treated on Friday may still look swollen on Monday. Plan social events, photos, and shaving around that window.
- Days 1-3: swelling, tenderness, and bruising build
- Days 4-7: lump softens and color fades
- Return to work: often 1-7 days
Why combine subcision with another treatment?
Combination treatment addresses release, surface texture, volume loss, and healing at once. A December 2022 randomized trial in Lasers in Medical Science found subcision plus fractional CO2 laser or cross-linked hyaluronic-acid filler improved atrophic scars more than subcision alone, with no serious side effects trial of combined treatment. Laser resurfaces texture while filler supports volume.
Either pairing can extend the benefit of release. Platelet-rich plasma is another practical adjunct where available. In Vietnamese patients with mainly mixed cheek atrophic scars, subcision plus platelet-rich plasma produced good-to-excellent responses and 96% satisfaction. Mixed scars are common, so pairing release with resurfacing, filler, or plasma fits real cases.
Does needle or cannula matter?
Both sharp-needle and blunt-cannula subcision can release tethered scars. A clinical-trials review found comparable efficacy between the two methods. Cannula use caused fewer side effects and higher patient satisfaction.
That difference matters for comfort and downtime. Fewer nicks to vessels and surrounding tissue means less bruising for many patients. Ask whether your clinic offers cannula subcision plus an adjunct for mixed scars.