Needle vs Cannula Subcision: How a Doctor Chooses

Subcision's job is always the same: get beneath a tethered scar and free the fibrous bands pulling it down, so the skin can rise and new collagen can build in the released space. What varies is the instrument doing the freeing, and the two main options approach the job from opposite philosophies.

The classic instrument is a hypodermic needle — most famously the 18G Nokor, whose tip is not a simple point but a flat, blade-like edge designed to cut. Inserted under local anaesthetic beside the scar, it is swept back and forth so the blade transects the bands directly. The alternative is a blunt-tipped cannula: a flexible instrument introduced through a single small entry point and tunnelled under a wider area. Its rounded tip does not slice — it separates, sweeping through planes of tissue and pushing past blood vessels and nerves rather than cutting through them.

Neither instrument wins outright — each trades something for something. The practical differences look like this:

The instrument follows the scar map. Dense, cord-like bands anchoring a single deep rolling scar respond best to the Nokor's blade — a blunt tip can slide over or deflect off a tough band that a cutting edge would transect. Diffuse, softer tethering across a broad area favours the cannula: one entry point, wide sweeps, and meaningfully less bruising to recover from. Location matters too — near concentrations of vessels and nerves, the blunt tip's tendency to push past structures rather than cut them is a genuine safety margin.

In practice, many sessions use both: cannula sweeps to undermine the broad area, then targeted needle work on the individual bands that resisted. This is why 'needle or cannula?' is not a checkbox on a booking form. You are not choosing between two products — the doctor is matching instruments to the anatomy found under your skin, sometimes adjusting mid-procedure based on what the bands actually feel like.

Searches for 'DIY subcision' and 'at-home subcision' exist, and videos circulate of people attempting it with sewing needles or store-bought hypodermics. This deserves an unambiguous answer: do not attempt subcision on yourself or anyone else. It is a medical procedure — a blade passed blind beneath the skin of the face, an area dense with branches of the facial nerve and significant blood vessels whose positions vary between individuals and can only be safely navigated with anatomical training.

The realistic harms of a home attempt are not hypothetical: laceration of vessels causing haematoma, damage to nerve branches that can alter facial movement or sensation, infection introduced beneath the skin where it is hardest to treat — and, with grim irony, new scarring worse than the scars being treated, because uncontrolled trauma is exactly how atrophic and tethered scars form in the first place. There is no sterile-technique tutorial that fixes this; the risk is anatomical, not hygienic.

If cost is what makes DIY tempting, the better path is a consultation and an honest written quote — plans can be staged and prioritised to fit a budget. A doctor-led session with the right instrument is a routine, well-tolerated procedure; a kitchen-table attempt is a gamble with your face.

Subcision research quickly runs into instrument jargon. These are the terms worth knowing before a consultation: