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A complete guide to subcision for depressed acne scars — how Orentreich's 1995 technique uses a needle or cannula to sever the fibrous bands tethering rolling and boxcar scars to the dermis, the mechanism of post-subcision fibroplasia, needle vs. cannula subcision, combination with HA filler (immediate volume) and RF microneedling, the number of sessions required for significant improvement, post-procedure bruising and swelling, and realistic expectations by scar type.
· By MedSpot Editorial · 6 min read
Subcision is a minimally invasive technique for treating depressed acne scars — particularly rolling and some boxcar scars — by mechanically cutting the fibrous bands tethering the scar floor to the underlying dermis. Released from their tethers, the scars elevate toward the skin surface. It was first described by Orentreich and Orentreich in 1995 and remains one of the most effective and frequently performed procedures for depressed acne scarring. Here is the complete guide.
Depressed acne scars — particularly rolling scars — are not simply areas of lost volume. The scar base is physically tethered to the deep dermis and subcutaneous tissue by fibrous bands: columns of dense collagen and fibrous tissue that formed during the wound-healing response to severe inflammatory acne. These bands:
Topical retinoids and laser can improve scar texture and stimulate collagen in the scar walls — but they cannot cut the fibrous tethers holding the scar floor down. Volume added with filler is pushed back into the skin from above — temporarily, before the tether reasserts the depression. Subcision cuts the tether.
A needle or blunt-tip cannula is inserted through the skin adjacent to the scar, advanced under the scar base in the subdermis, and moved back and forth with a fanning motion — mechanically severing the fibrous tethering bands.
Two effects:
The hematoma as scaffold: The pooled blood under subcised scars is intentional. It provides the fibrin scaffold into which fibroblasts migrate. Aspirating the hematoma (which some providers do to reduce bruising) partially defeats this mechanism. Many experienced subcision practitioners deliberately leave the hematoma in place.
The original Orentreich technique used a standard hypodermic needle. The Nokor needle — a specific tri-bevel design — cuts more efficiently through fibrous tissue.
Advantages: More precise; better for focal, discrete scars; more cutting force for dense fibrous bands.
Disadvantages: Sharp tip; higher risk of hematoma beyond the scar base; more discomfort; requires topical + local anesthetic.
Blunt-tip cannulas are increasingly used for subcision — the blunt tip dissects through tissue planes rather than cutting, reducing hematoma formation beyond the treatment zone.
Advantages: Reduced bruising; can treat larger areas per entry point; lower risk of inadvertent vessel puncture.
Disadvantages: Less effective for very dense fibrous tethers; requires larger entry points.
Current practice: Many providers use cannula for broader rolling scar areas and needle (Nokor) for focal boxcar scars with dense tethering.
Rolling scars are the best candidates for subcision. Their mechanism — fibrous band tethering to the deep dermis — is precisely what subcision addresses.
Improvement per session: 20–40% elevation in scar depth per session; typically 2–4 sessions at 4–8 week intervals for meaningful improvement.
Boxcar scars have steep vertical walls and a flat floor. The fibrous tethering component is less universal — some boxcar scars benefit from subcision (those with a tethered floor); others with sharply defined edges require TCA CROSS (trichloroacetic acid chemical reconstruction of skin scars) or punch elevation/excision for the wall component.
Ice pick scars are narrow, deep epidermal tunnels. Their narrow diameter (< 1 mm) means subcision cannot effectively treat them — the needle cannot maneuver within the scar tract. TCA CROSS is the primary treatment for ice pick scars.
The most common combination: subcision releases the tether; HA filler injected immediately into the subcised space:
Timing: Filler can be placed in the same session (immediately post-subcision) or at 4–6 weeks when the subcision-induced tissue response has stabilized.
Subcision addresses the tethering; RF microneedling addresses scar texture and wall irregularity. Optimal sequencing:
Performing RF microneedling before subcision is less effective — the scar is still tethered; thermal collagen stimulation in a tethered scar contributes less to elevation.
For mixed scar morphology (rolling + ice pick on the same patient), subcision treats rolling scars and TCA CROSS is applied to ice pick scars in the same or sequential sessions.
Subcision is performed under:
The procedure is well-tolerated under adequate local anesthesia; patients report pressure sensation rather than sharp pain.
Bruising: Significant bruising is expected — the mechanism depends on hematoma formation. The treated areas are purple-black for 7–14 days. This is normal and expected; patients must be counseled before treatment.
Swelling: Edema peaks at 24–48 hours; resolves within 5–7 days.
Social downtime: 5–14 days depending on scar density and extent of treatment.
Post-procedure care: No active exercise for 48 hours (to limit hematoma extension); SPF protection; avoid pressure on treated areas. No massage of treated areas — allows hematoma fibroplasia to proceed.
| Protocol | Sessions | Improvement in Rolling Scar Depth | Durability |
|---|---|---|---|
| Subcision alone | 2–4 × 6 weeks | 30–50% per course | Long-lasting (new collagen) |
| Subcision + filler | 1–2 + maintenance filler | 50–70% initial; maintain with filler | Filler 12–18 months; structural improvement long-lasting |
| Subcision + RF microneedling | 2–3 each | 60–80% improvement (combined) | Long-lasting |
| Subcision + TCA CROSS (mixed) | 3–4 each | 50–70% (type-specific) | Long-lasting |
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