Subcision for acne scars how it releases rolling scars, and what recovery is really like

The basics

What is subcision?

Subcision is a minor procedure in which a doctor passes a fine needle or a blunt cannula under a depressed scar, through a tiny entry point, and cuts the fibrous bands that tie the scar down to deeper tissue. Once those bands are released, the skin can rise, and the small controlled injury prompts new connective tissue to form in the space underneath.

The name is short for subcutaneous incisionless surgery. It was described by Orentreich and Orentreich in 1995 for depressed scars and wrinkles, and it is now a standard part of acne scar treatment in dermatology. There is no cut on the surface and no stitches; the only marks are small entry points that close within days.

Subcision does not resurface skin, remove pigment or fill volume on its own. It solves one specific problem, tethering, which is why it is usually one step in a wider scar plan rather than the whole plan.

Which scars

Which acne scars respond to subcision

Subcision suits rolling scars: broad, soft dips with sloping edges that make the skin look wavy, especially in side lighting. They are pulled down from below by fibrous strands, so the surface itself is fairly intact. Some boxcar scars also have a tethered base and can lift partly after subcision.

A simple check is the stretch test. Gently stretch the skin around the scar between two fingers. If the dip softens or flattens, it is likely tethered and may respond to subcision. If it stays the same, as ice pick and sharp-walled boxcar scars usually do, other methods do more of the work.

Subcision is not for raised (hypertrophic or keloid) scars, flat red or brown acne marks, or narrow ice pick scars, which are too small and deep for a needle to release.

The procedure

How subcision is done, step by step

Two kinds of instrument are used. A sharp needle cuts the bands crisply; a blunt cannula glides through the tissue with less risk of injuring blood vessels. A review of clinical trials found both gave comparable improvement, with the cannula causing fewer side effects. Wires and blade-like instruments also exist, and the doctor chooses by scar depth and area.

• The doctor maps the scars under angled light and marks the ones that are tethered.
• Numbing cream is applied, usually for 45 to 60 minutes, and the area is cleaned.
• Local anaesthetic is injected so the deeper layer is numb.
• The needle or cannula enters through a tiny puncture and is moved in a fanning motion just under the scar, parallel to the surface. You may feel pressure or hear a faint snapping as bands release.
• Firm pressure is applied to limit bleeding under the skin, and a cold pack may be used.
• The entry points are small and usually need only a plaster or ointment.

Downtime

Bruising, swelling and downtime after subcision

Bruising is the main downtime. Because the procedure works by cutting under the skin, some bleeding into the released space is expected, and that small pocket of blood is part of how new tissue forms. Swelling also lifts the scars for the first few days, so early results look better than the final result; do not judge it in the first week.

Most people plan around one to two weeks before a social event. Bruising usually fades from purple to yellow-green over that time, though on 4D Scar Reconstruction it can take up to two weeks to clear. Make-up can usually go over bruises once the entry points have closed.

Combinations

Subcision with fillers and energy devices

A released scar can re-attach as it heals, which is one reason results vary. To keep the space open and add support, doctors often combine subcision with a filler or a collagen-stimulating injectable placed under the scar, or with suction afterwards. A review of 16 clinical trials found that combining subcision with fillers or repeated suction improved results and helped prevent scars from sinking again, and that combinations with microneedling or RF microneedling were safe and effective.

Subcision lifts the floor of a scar but does not refine its edges or surface texture. That is the job of fractional CO2 laser or RF microneedling. In a randomised trial of 40 patients, subcision combined with either a cross-linked hyaluronic acid filler or fractional CO2 laser gave more improvement than subcision alone, with no significant difference between the two combinations.

Order matters. Subcision is usually done before resurfacing, so the laser works on skin that has already been released, and sessions are spaced to let each step heal.

Evidence

What the research on subcision shows

In a study of 40 patients with rolling scars followed for six months, patients and investigators reported about 50% improvement, and 90% of patients said subcision improved their appearance. Swelling, bruising and pain were temporary, but some patients had persistent firm bumps at treated sites.

A systematic review of non-energy treatments reported improvement after subcision ranging from 10% to 100% across studies, which shows how much results depend on scar type, technique and the person. A 2023 evidence review placed subcision in the lower-quality evidence group compared with lasers and fillers, mainly because many studies are small and use different scoring systems.

The honest summary: subcision is well established for rolling scars and is low-tech and safe in trained hands, but it rarely clears scars on its own. Most improvement comes from combining it with other steps over several months.

Risks

Risks, and who should wait

Wait or ask a doctor first if you have active acne in the area, a skin infection or cold sore, a bleeding disorder, a tendency to keloids, or are pregnant. Tell the doctor about blood-thinning medicines and supplements, but do not stop prescribed medicines without advice. If you have recently taken isotretinoin, timing is discussed individually.

• Bruising and swelling: expected; occasionally a larger collection of blood (haematoma) needs draining.
• Firm lumps under treated scars: usually soften over weeks to months, but can persist.
• Darkening (PIH) over bruised areas: more likely in Asian skin; sun protection helps it fade.
• Infection: uncommon; report increasing pain, heat or pus.
• Scars that sink again, or improve less than hoped: further sessions or other methods may be needed.
• Rarely, injury to a nerve or larger blood vessel; anatomy knowledge and technique keep this low.

In Singapore

Subcision in Singapore: part of 4D Scar Reconstruction

Subcision is a medical procedure performed by a doctor. In our network, Dr Sin Yong performs it at IN Eternity Clinic, 9 Scotts Road, #12-01 Pacific Plaza, beside Orchard MRT, as part of his 4D Scar Reconstruction protocol, which matches subcision, TCA CROSS, fractional CO2 laser and, where needed, an injectable to each scar type. Not everyone needs all four. It is priced at consultation by the clinic after the scars are assessed; WhatsApp +65 8815 3008.

SkinRev Lab, at CityLink Mall #B1-28 by City Hall MRT, is a non-invasive centre and does not perform subcision. It can help with surface texture and calming acne-prone skin, and it passes enquiries about medical scar treatment to the clinic.

Before you book

Questions to ask before subcision

• Which of my scars are tethered, and which are not?
• Will you use a needle or a cannula, and why?
• What else will be combined with it, and in what order?
• How many sessions are likely, and how far apart?
• How long should I allow for bruising before an event?
• Who performs the procedure, and who reviews me afterwards?
• What happens if I develop lumps or darkening?

Sources

References & sources

1. Orentreich DS, Orentreich N. Subcutaneous incisionless (subcision) surgery for the correction of depressed scars and wrinkles. Dermatol Surg. 1995;21(6):543-549.
2. Jacob CI, Dover JS, Kaminer MS. Acne scarring: a classification system and review of treatment options. J Am Acad Dermatol. 2001;45(1):109-117.
3. Alam M, Omura N, Kaminer MS. Subcision for acne scarring: technique and outcomes in 40 patients. Dermatol Surg. 2005;31(3):310-317.
4. Ahramiyanpour N, Rastaghi F, Parvar SY, et al. Subcision in acne scarring: a review of clinical trials. J Cosmet Dermatol. 2023;22(3):744-751.
5. Abdelwahab AA, Omar GAB, Hamdino M. A combined subcision approach with either fractional CO2 laser (10,600 nm) or cross-linked hyaluronic acid versus subcision alone in atrophic post-acne scar treatment. Lasers Med Sci. 2022;38(1):20.
6. Kravvas G, Al-Niaimi F. A systematic review of treatments for acne scarring. Part 1: Non-energy-based techniques. Scars Burn Heal. 2017;3:2059513117695312.
7. Kim EY, Wong JH, Hussain A, Khachemoune A. Evidence-based management of cutaneous scarring in dermatology part 2: atrophic acne scarring. Arch Dermatol Res. 2023;316(1):19.

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