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Subcision is a minor in-office medical procedure for depressed, tethered scars—most often rolling acne scars. A needle or blunt cannula is passed beneath the scar to release the fibrous bands pulling it down, allowing the surface to lift; it is frequently combined with fillers or laser treatments in a broader scar-revision plan.
Subcision targets depressed scars that are tethered downward by fibrous strands beneath the skin. The classic use is for rolling acne scars on the cheeks—shallow, saucer-like depressions with soft, sloping edges. A common bedside clue is that these scars flatten noticeably when the surrounding skin is stretched. It is sometimes also used for tethered depressions left by injury or surgery, but whether a specific scar is suitable should be judged in person by a physician.
What subcision does is cut the anchor holding a scar down; it does not resurface the skin or rebuild lost texture on its own. Deep, narrow ice-pick scars and sharply punched-out boxcar scars generally respond poorly and are usually managed with other techniques. Improvement after one session is typically partial, which is why clinicians often plan several sessions, or pair subcision with fillers, laser resurfacing, or microneedling as part of a broader strategy.
A tethered scar sits low because fibrous bands run from its underside to deeper tissue, pulling the surface down. During subcision, the clinician inserts a hypodermic needle—often one with a special bevel—or a blunt cannula through a small entry point and sweeps it back and forth beneath the scar to cut or loosen those bands. The release itself lets the scar lift, and the small pocket of controlled bleeding left underneath stimulates new collagen that helps support the skin from below.
At the visit, scars are usually mapped and photographed, and the area is numbed with topical or injected local anesthetic. During the sweeping motions most people feel pressure, tugging, and occasional snapping sensations rather than sharp pain. Swelling and bruising appear almost immediately and are expected. Most people return to routine activities within days, while the visible lift develops gradually over weeks to months as collagen remodels; when several sessions are planned, they are commonly spaced about a month or more apart.
The clearest candidate is an adult whose breakouts are largely under control, with rolling or otherwise tethered depressed scars—typically from acne—that visibly soften when the skin is stretched. A worthwhile consultation should map which scars are actually tethered, discuss how many sessions may be needed, whether fillers, laser, or microneedling should be layered in and in what order, how much bruising downtime you can accept, and what degree of improvement is realistic on your skin.
Subcision is not appropriate for everyone. Active acne or infection in the treatment area should be controlled first. People with a history of keloids or hypertrophic scarring, bleeding or clotting disorders, or those taking blood-thinning medication need careful evaluation, and some may be advised against it. Tell the clinician about pregnancy, recent procedures in the same area, medications and supplements, and any tendency to pigment darkly after inflammation—these details can change the plan or its timing.
Swelling, bruising, tenderness, and pinpoint bleeding at the entry points are expected. Bruising can be prominent and typically fades over one to two weeks; the treated area may also feel firm or lumpy for a while as the space beneath the scar heals, and this usually softens on its own. Because subcision breaks the skin, it is a medical procedure that should be performed at a licensed medical institution by a qualified, licensed physician—not in a general beauty-services setting.
Less common problems include infection, nodules or firmness that persist longer than expected, post-inflammatory hyperpigmentation—more likely in deeper skin tones—temporary numbness from irritation of small nerves, and, uncommonly, a raised or hypertrophic response instead of a lift. Released scars can also re-tether over time, which is one reason repeat sessions are sometimes planned. Technique and depth matter, particularly near areas where facial nerves and vessels run.
Contact the treating physician promptly if pain keeps worsening, the area becomes hot, increasingly red, or drains fluid, a bruise expands rapidly, numbness does not fade, or a lump grows harder or larger over the following weeks. This article is general information only; it cannot replace an in-person consultation, an individual assessment of your scars, or the judgment of the doctor who examines you.