How Subcuticular Sutures Work for Cosmetic Wound Closure

A subcuticular suture is a stitch placed just beneath the outer layer of skin, running horizontally through the dermis so that no thread crosses the visible surface. Because the suture material stays hidden, the technique leaves behind a thinner, flatter scar than methods that punch through the skin, like staples or traditional interrupted stitches. Surgeons across specialties reach for it when appearance matters, but the technique also has real implications for infection risk, healing time, and patient comfort that go well beyond cosmetics.

How the Technique Works

In a running subcuticular closure, the surgeon passes a single continuous thread back and forth through the dermis on alternating sides of the wound, creating a zigzag pattern that sits entirely below the skin surface. The thread enters and exits through tiny punctures at either end of the incision. This is different from interrupted sutures, where each stitch is individually knotted and the thread loops visibly over the wound edge, and from staples, which clip through the epidermis from above.

The mechanical advantage is straightforward: because the thread runs parallel to the skin surface rather than looping over it, the tension is spread more evenly across the wound. A finite element modeling study found that the running subcuticular technique produces more uniform stress distribution in the dermis compared with buried vertical mattress sutures, reducing the concentration of force at any single point along the incision.¹ That even distribution is part of why subcuticular closures tend to produce less visible scars: the skin heals without the “railroad track” marks that form when thread crosses the surface under tension.

Cosmetic Results Compared With Staples and Interrupted Sutures

For many patients, scar appearance is the single most important measure of a successful wound closure. The evidence consistently favors subcuticular sutures over staples for long-term cosmetic outcomes, though the gap sometimes takes months to become apparent. A meta-analysis of cesarean deliveries found that subcuticular sutures and staples looked similar at six to eight weeks, but subcuticular sutures produced better cosmetic results at six to twelve months.² In knee replacement surgery, running subcuticular closure produced a better-looking scar than intermittent closure, even though the two methods performed similarly in terms of joint function and infection rates.³

Patient-rated scar scores tell a similar story. In a cesarean section study comparing subcuticular suture with intradermal buried suture, patients graded the subcuticular scars more favorably on color, stiffness, and thickness compared with the surrounding skin.⁴ A Cochrane review covering non-obstetric surgeries concluded that subcuticular sutures probably improve patient satisfaction, with moderate- to high-certainty evidence supporting a meaningful bump in satisfaction scores compared with alternative closure methods.⁵

There is one setting where the cosmetic advantage narrows considerably. A randomized trial of facial surgery found that simple interrupted sutures and running subcuticular sutures produced comparable cosmetic outcomes at twelve months, with identical median patient scores.⁶ Facial skin is thin, richly supplied with blood, and heals well regardless of closure method, which may explain why the technique matters less there than on the trunk or limbs.

Infection and Wound Healing

Whether subcuticular sutures actually prevent surgical site infections depends on what you compare them with and where the wound is. The picture is clearest when staples are the alternative. In posterior lumbar spine surgery, a single-surgeon series found that deep infection rates were roughly four times lower in patients closed with a running subcuticular absorbable suture compared with staples.⁷ In hip replacement via a minimally invasive approach, prolonged wound drainage lasting a week or more was about five times as common in patients who received staples, and there was a trend toward more wound and implant revisions in the staple group as well.⁸

But a large meta-analysis of abdominal surgery found no significant difference in infection rates between subcuticular sutures and staples when the data were pooled across thousands of patients.⁹ The wound dehiscence rates were also statistically similar between the two methods. So the infection advantage of subcuticular closure likely depends on factors like wound location, the amount of tension on the skin, and the depth of underlying tissue that could harbor bacteria. Orthopedic wounds over hardware and spine incisions with deep tissue planes may benefit more from the sealed, surface-crossing-free closure that a subcuticular suture provides, while a straightforward midline abdominal incision may heal similarly either way.

Absorbable Versus Non-Absorbable Thread

Once you have decided on a subcuticular closure, the next question is what material to sew with. Absorbable sutures break down on their own over weeks to months and never need removal. Non-absorbable sutures stay put until someone pulls them out, typically after one to two weeks. Each has trade-offs.

In cesarean section closures, a trial comparing absorbable polyglactin with non-absorbable polypropylene found similar wound complication rates and no difference in pain or itching. The cosmetic results trended slightly better in the non-absorbable group for first-time cesareans, but the difference was not statistically significant, and polypropylene took longer to place.¹⁰ Another cesarean study found that non-absorbable polypropylene had lower rates of surgical site infection and seroma than absorbable polyglactin, though it again required more time and the inconvenience of a return visit for suture removal.¹¹

A randomized trial comparing three approaches for cesarean skin closure found that absorbable monocryl sutures scored highest on both patient and surgeon satisfaction, outperforming non-absorbable nylon and staples. Pain, however, was greatest with nylon, and staples had the most wound dehiscence.¹² The practical upshot is that absorbable monofilament sutures have become the default for most subcuticular closures. They are easier on the patient, avoid a removal visit, and produce comparable or better cosmetic and healing outcomes in most contexts. Non-absorbable material still has a niche when a surgeon wants maximum control over how long the suture stays in place, or in settings where the lower complication rate seen in some studies justifies the extra handling.

The Suture Extrusion Problem

One complication that is specific to subcuticular technique is suture extrusion, where the thread migrates to the skin surface and pokes through. The body treats any foreign material as something to push out, and some suture materials provoke this reaction more than others. A direct comparison of two common absorbable materials found that polyglactin (sold as Vicryl) extruded in about eleven percent of cases, while poliglecaprone (sold as Monocryl) extruded in only about three percent.¹³ Monocryl is a monofilament, meaning it is a single smooth strand, whereas Vicryl is braided from multiple filaments. The braided structure creates a rougher surface with more crevices that can irritate tissue and harbor bacteria, which partly explains the higher extrusion rate.

Thin or fragile skin increases the risk of extrusion further. Elderly patients, people on long-term corticosteroids, or anyone whose skin has been thinned by radiation or chronic sun damage may not be good candidates for a subcuticular closure, because the dermis is not thick enough to hold the suture in place reliably.¹⁴ In these patients, surgeons often switch to interrupted skin sutures or adhesive strips that do not depend on dermal integrity.

Barbed Sutures and Hybrid Closures

Barbed sutures are a relatively recent twist on subcuticular technique. Instead of a smooth thread, the material has tiny backward-pointing barbs along its length that grip the tissue and hold tension without knots. The surgeon can run the suture through the dermis and cut it without tying off either end, which speeds things up considerably. In neck dissection surgery, subcutaneous closure with barbed sutures was significantly faster than closure with conventional interrupted sutures, shaving about a minute off the procedure with no significant difference in adverse events.¹⁵

In knee surgery on young athletes, barbed knotless sutures and smooth sutures produced similar rates of wound dehiscence and similar need for debridement, suggesting that the barbed design does not introduce extra healing problems in an active population.¹⁶ Some surgeons have taken the hybrid approach further, combining barbed subcuticular sutures with skin adhesive (cyanoacrylate glue) on top. One study of lower-limb joint replacement found that this combination dropped the rate of prolonged wound oozing from about fourteen percent to one percent, which translated to shorter hospital stays and meaningful cost savings per patient.

Speed Versus Appearance

The single consistent disadvantage of subcuticular sutures is that they take longer to place. Staples are fast: a surgical stapler can close a long incision in under a minute. A running subcuticular closure on the same wound might take several minutes, depending on the surgeon’s experience and the wound length. A large review of cesarean deliveries confirmed this pattern, finding that staple closure was associated with shorter operative time but a higher risk of wound complications, while subcuticular sutures took longer but produced equivalent or better outcomes in pain, cosmesis, and satisfaction.¹⁷

The time cost matters most in emergency or high-volume settings where operating room minutes are expensive and patients are waiting. In elective procedures where a few extra minutes of closure is a small fraction of total surgical time, the speed difference is rarely a deciding factor. Barbed sutures help narrow the gap, and experienced surgeons simply get faster with practice.

When Subcuticular Closure Is Not the Right Choice

Not every wound is suited to this technique. High-tension closures, such as incisions across the back or over large joints that bend repeatedly, may pull apart if the only skin-level support is a subcuticular thread. In these situations, surgeons often place deep dermal sutures first to take tension off the wound edges, then add a subcuticular suture on top purely for cosmetic edge alignment. Without that deep layer, the subcuticular stitch alone can cut through the dermis.

Contaminated wounds, heavily traumatized tissue, and wounds that may need to be reopened for drainage are all poor candidates. A subcuticular closure seals the wound edges tightly, which is a disadvantage if fluid needs to escape. Staples or loosely placed interrupted sutures allow easier access for wound checks and partial opening if needed.

Patients with extremely thin skin, as mentioned earlier, are another group where the technique may cause more problems than it solves. And in some anatomical locations, like the scalp, where the skin is thick and covered by hair, the cosmetic benefit of hiding the suture is irrelevant, making faster alternatives perfectly reasonable.

What Patients Should Know About Aftercare

If your wound was closed with an absorbable subcuticular suture, there is usually nothing visible to remove. The thread dissolves on its own over weeks, and the ends are either buried or trimmed flush with the skin. You may notice a small thread end poking out at the corner of the incision, which is normal and can be snipped by your surgeon at a follow-up visit. If non-absorbable material was used, the suture needs to be pulled out, typically at seven to fourteen days. This involves gently tugging one end while the thread slides through the dermal tunnel, and most patients describe it as uncomfortable but not painful.

The cosmetic benefit of a subcuticular closure depends partly on how you care for the wound afterward. Sun protection matters: ultraviolet exposure darkens new scars and can make them more visible long term. Silicone-based scar sheets or gels, applied after the incision has sealed, can further reduce scar thickness and discoloration. Keeping the wound clean and dry during the initial healing period helps, but obsessive cleaning or applying hydrogen peroxide can actually slow healing by killing the cells that are trying to close the gap.

Learning the Technique

Subcuticular suturing is one of those skills that looks simple in a video but requires real practice to do well. The needle must travel at a consistent depth and take equal bites on each side, or the wound edges will not line up evenly. Too shallow, and the suture will show through or extrude. Too deep, and it will not approximate the skin edges properly. A study of medical students found that practicing with an instructional video produced lasting skill improvement that held up on a retention test, suggesting that the technique can be learned outside the operating room with deliberate practice on simulation materials.¹⁸

For practicing surgeons switching from staples to subcuticular technique, the learning curve is real but manageable. Closure times drop steadily with repetition, and most surgeons report reaching a comfortable pace within a few dozen cases. Given the evidence favoring subcuticular closure for both cosmetic outcomes and, in many settings, lower wound complications, the investment in learning the technique pays off across a career.

Subcuticular Sutures in Veterinary Surgery

The technique is not limited to human patients. In veterinary medicine, subcuticular closure avoids the problem of animals chewing or scratching at visible stitches, which is a constant source of complications after procedures like spays. A study comparing knotless subcuticular sutures with traditional cruciate skin sutures in dogs undergoing ovariohysterectomy found that wound reactions occurred in none of the subcuticular group compared with roughly a quarter of the dogs closed with conventional external stitches.¹⁹ Burying the suture below the skin eliminates the loops and knots that irritate the animal, reducing the need for Elizabethan collars and post-operative sedation. The same principles that make subcuticular closure appealing in humans apply with equal or even greater force in patients who cannot be told to leave their stitches alone.