A punch excision is a minor skin procedure that uses a small, circular cutting tool to remove a piece of skin through its full thickness. It’s commonly used to treat deep acne scars, remove small moles, and take tissue samples for diagnosis. The procedure is done under local anesthesia in a dermatologist’s office and typically takes just a few minutes.
How the Punch Tool Works
The instrument itself is a circular hollow blade attached to a pencil-like handle. Think of it like a tiny cookie cutter for skin. It comes in diameters ranging from 2 mm to 10 mm, though 3 to 4 mm sizes are the most commonly used. The dermatologist presses the tool against the skin and rotates it with a slow, gradual motion to cut through the outer skin, the deeper skin layer, and into the fat beneath. This produces a small, cylindrical core of tissue that can be lifted out cleanly.
Smaller punches (2 mm) are sometimes chosen for facial procedures to minimize visible scarring. Larger sizes may be used on the body or when more tissue needs to be removed. The tools are available in both disposable and reusable versions.
Punch Excision vs. Punch Biopsy
These two procedures use the same tool but serve different purposes. A punch biopsy removes a small sample of a larger area so a lab can identify what’s going on. It’s a diagnostic step. A punch excision, by contrast, removes an entire lesion or scar. The goal is therapeutic: you’re getting rid of the problem, not just sampling it. In practice, the line between them blurs. A small mole under 5 mm, for example, can be completely removed with a punch tool, making the procedure both diagnostic (the tissue goes to a lab) and therapeutic (the mole is gone).
What It Treats
Punch excision is most widely known as a treatment for acne scars, specifically the deep, narrow types that don’t respond well to resurfacing treatments like lasers or chemical peels. It’s rated highly effective for two scar types in particular:
- Ice pick scars: Narrow, deep pits that extend into the deeper skin layers. These are the scars that look like they were made with a sharp point. Punch excision is one of the most effective treatments available for them.
- Boxcar scars: Broader depressions with defined edges. Punch excision works well for smaller boxcar scars, generally under 3.5 mm. For scars larger than that, a traditional elliptical excision with a scalpel may produce better results.
Rolling scars, the wide, shallow undulations that give skin a wave-like appearance, don’t respond to punch excision and are better treated with other approaches.
Beyond acne scars, dermatologists use punch excision to remove small moles (particularly dome-shaped ones under 5 mm on the face, where it can leave a nearly imperceptible scar compared to a standard surgical cut), corns, and certain types of bumps at the back of the neck caused by ingrown hairs. The punch is pushed deep enough to remove the entire hair follicle or lesion core in one piece.
What Happens During the Procedure
The area is first cleaned with an antiseptic. Then a local anesthetic, typically lidocaine, is injected around the treatment site. You’ll feel a brief sting from the needle, but the area goes numb within a minute or two.
The dermatologist selects a punch tool slightly larger than the scar or lesion being removed. They place it over the target, apply gentle downward pressure, and rotate it to cut through the skin. The small cylinder of tissue is lifted out, and the wound is closed with one or two stitches. For acne scars, this effectively trades a deep, irregular scar for a fine, flat surgical line that’s much easier to treat or conceal later.
The entire process for a single scar or lesion takes only a few minutes. Multiple scars can be treated in the same session. Some dermatologists combine punch excision with laser resurfacing afterward to help blend the edges of the new scars into the surrounding skin.
Recovery and Wound Care
Recovery is straightforward. The site will be covered with a small bandage, and you’ll need to keep the wound clean and dry while it heals. Stitches on the face, scalp, or neck are typically removed after about 7 days. Stitches on other parts of the body stay in for roughly 14 days.
During healing, you can expect mild soreness and some redness around the site. The resulting scar will initially look like a thin line or small dot, then gradually fade over several months. For acne scar treatment, the flat surgical scar is a significant cosmetic improvement over the original deep pit, even before any additional resurfacing is done.
Risks and Complications
Punch excision has a very low complication rate. In a large analysis of nearly 1,300 patients, the most common issues were minor bleeding at the site (0.9% of patients), wound infection (0.2%), accidental injury to surrounding skin (0.2%), and fainting during the procedure (0.1%). Serious complications are rare.
The main cosmetic concern is that the new scar could widen, thicken, or become raised, particularly in people who are prone to keloids or hypertrophic scarring. Your dermatologist will assess your skin type and scarring history before recommending the procedure. Location matters too: skin on the chest and shoulders tends to scar more prominently than facial skin.
When Punch Excision Is Combined With Other Treatments
For people with multiple types of acne scars, punch excision is rarely the only treatment used. It handles the deepest scars that other methods can’t reach, but broader or shallower scars respond better to laser resurfacing, microneedling, or filler injections. A common treatment plan excises the worst ice pick scars first, allows them to heal for several weeks, then uses fractional laser treatment across the entire area to smooth out remaining texture and blend the surgical scars into the surrounding skin. This layered approach tends to produce better overall results than any single technique alone.