What is subcision?
Subcision is a minor surgical procedure used mainly for depressed scars that are being pulled downward by fibrous bands under the skin. Instead of resurfacing the top of the scar, the clinician passes a needle, blunt cannula or another subcision instrument beneath it and releases those attachments.
The goal is simple: free the scar so it can sit higher, then allow healing and new connective tissue to support the area. This makes subcision fundamentally different from laser resurfacing, microneedling or chemical peels, which mainly work by creating controlled injury in the skin itself.
Which acne scars respond best to subcision?
Subcision is most useful for rolling acne scars: broad, soft-edged depressions that are tethered to deeper tissue. Some shallow or moderately deep boxcar scars can also improve when tethering contributes to their depth.
It is usually much less useful for narrow ice-pick scars. Those often need a different strategy, such as TCA CROSS or punch techniques. Raised hypertrophic and keloid scars are not treated with subcision.
This matters because many people have several scar types at the same time. A face covered with mixed rolling, boxcar and ice-pick scars rarely has one perfect treatment.
How can I tell if a scar is tethered?
A tethered scar may look deeper when the face moves or under side lighting, and it may partly improve when the surrounding skin is stretched. But the “stretch test” is not perfect. Scar depth, firmness, location and the direction of the fibrous bands also matter.
A useful consultation should therefore involve examination from different angles and with facial movement, not only a front-facing photograph. If your scars are mostly sharp-edged holes or surface texture changes, releasing tissue underneath may add little.
How does subcision actually improve a scar?
The instrument is moved beneath the scar to cut or disrupt the fibrotic strands that anchor it downward. This creates a small controlled wound under the skin. Blood and inflammatory cells enter the space, followed by repair tissue and collagen remodelling.
Part of the early improvement may come from swelling and the temporary space created under the scar. The result should therefore be judged after healing, not during the first few days.
What happens during a subcision treatment?
The area is cleaned and marked, then local anaesthetic is injected. Depending on the technique, the clinician may enter directly beneath individual scars or use one or a few entry points to treat a larger field with a cannula.
You may feel pressure, tugging or a popping sensation even when the area is numb. Treatment time depends on how many scars are released. Subcision is commonly performed as an outpatient procedure.
Does the type of needle or cannula matter?
Yes. Traditional sharp needles can cut dense fibrous bands efficiently, while blunt cannulas can cover broader areas through fewer entry points. Reviews suggest cannula-based techniques may cause less bruising, pigment change and iatrogenic scarring than sharper instruments in some settings, but no tool is best for every scar.
Wire, blunt-blade and energy-assisted techniques also exist. What matters more than the marketing name is whether the instrument and depth are appropriate for the scar and the anatomy underneath it.
How many sessions will I need?
Some people see a meaningful change after one session, but two or more treatments are common when scarring is extensive or strongly tethered. Sessions are usually separated to allow swelling and remodelling to settle before deciding what still needs release.
Recent randomized and comparative studies confirm that subcision can improve atrophic acne scars, especially rolling scars, but the size of the improvement varies widely. Expect improvement, not perfectly smooth skin.
Does subcision work better with filler, PRP or other add-ons?
Sometimes, but an add-on is not automatically necessary.
- Hyaluronic acid filler can support a depression after release when there is also volume loss. It adds its own risks and cost.
- PRP or growth-factor preparations are sometimes added to encourage healing. Evidence is mixed and protocols are not standardized.
- Laser or RF microneedling can be useful later for surface texture and collagen remodelling that subcision does not address.
- TCA CROSS or punch techniques may be better for ice-pick or sharply edged scars.
A 2024 randomized split-face trial found no statistically significant objective advantage from adding a hyaluronic-acid mesogel to subcision, despite higher patient satisfaction on the combination side. Trials of post-subcision suction have also shown limited or inconsistent objective benefit. In other words, more procedures do not automatically mean more improvement.
How does subcision compare with laser or microneedling?
They solve different parts of the scar.
- Subcision targets the fibrous tether beneath a depressed scar.
- Fractional laser remodels skin and can improve texture, edges and some scar depth.
- Microneedling or RF microneedling stimulates dermal remodelling and may help shallower mixed scars.
- Filler restores volume but does not necessarily cut the tether unless release is also performed.
This is why someone can have several laser sessions and still retain rolling depressions: resurfacing cannot reliably free a strong attachment underneath. Conversely, subcision alone may lift a scar but leave pores, pigment changes and surface irregularity untouched.
How should I prepare for subcision?
Active inflammatory acne should ideally be under control before scar procedures begin. Tell the clinician about medicines and supplements that affect bleeding, previous filler or permanent injectable material, a tendency to keloid, recent infection, and any history of abnormal wound healing.
Do not stop prescribed anticoagulants or other medication on your own. If changes are appropriate, they should be agreed with the prescribing clinician.
What is the downtime after subcision?
Bruising and swelling are expected. Tenderness, small entry-point crusts and temporary firmness or lumpiness can also occur. Social downtime is often several days, but extensive treatment can look bruised for one to two weeks.
Clinics vary in aftercare. Typical advice includes keeping entry points clean, avoiding unnecessary pressure or manipulation while the area is acutely swollen, and using sun protection to reduce post-inflammatory pigment change.
What are the common risks?
The most consistently reported problems are bruising, swelling, pain or tenderness, temporary lumps and post-inflammatory hyperpigmentation. These are generally self-limited, but pigment changes may persist longer in darker skin tones.
Published studies use very different instruments, scar severities and reporting methods, so there is no reliable single percentage for “the complication rate.” Giving one precise number would be misleading.
What rare or more serious complications can happen?
Less common problems described in the literature include hematoma, infection, persistent nodules or fibrosis, contour irregularity, new depressions, hypertrophic or iatrogenic scarring and prolonged altered sensation. Injury to vessels, nerves or important facial retaining structures is anatomically possible, especially with aggressive treatment or sharp instruments in higher-risk areas.
The 2025 safety review found complications were more often associated with sharp instrumentation. That does not make blunt cannulas risk-free; technique, depth and anatomical knowledge still matter.
Can subcision make acne scars worse?
It can, although this is not the usual outcome. Over-treatment can create excessive trauma, fibrosis, irregular contours or a new visible entry scar. Under-treatment can leave the tether intact. A scar can also re-depress as it heals.
This is one reason to be cautious about very aggressive “one-session transformation” promises. Acne-scar correction is often staged because each scar behaves differently.
What result should I realistically expect?
For a properly selected rolling or tethered scar, subcision can produce a genuine structural improvement that resurfacing alone may not achieve. The aim is usually a shallower, softer depression and a more even transition into surrounding skin.
It is not an eraser. Deep mixed scarring commonly needs a combination plan, and results should be judged over months as swelling disappears and tissue remodels. The best treatment is the one matched to the scar type, not the one with the longest list of add-ons.
