A failed skin graft typically looks dark, dusky, or black rather than the healthy pink-to-red color that signals successful healing. Instead of gradually blending with surrounding tissue, the graft may appear pale or white in the early days after surgery, then progress to purple, brown, or frankly necrotic black patches. Foul smell, persistent drainage, and tissue that lifts easily from the wound bed are other hallmarks. The visual progression varies depending on whether the graft is failing from poor blood supply, infection, or mechanical disruption, and failure does not always happen all at once.
What Healthy Graft Healing Looks Like as a Baseline
Understanding what failure looks like requires knowing what success looks like first. In the first 24 to 48 hours after placement, a skin graft survives by absorbing nutrients directly from the wound bed through a process sometimes called plasmatic imbibition. During this window, the graft often appears pale or slightly bluish, which is normal. Over the next several days, tiny blood vessels from the wound bed grow into the graft and connect with the graft’s own vascular channels. By about day seven, a successful graft has reperfused enough that its blood flow approaches that of the surrounding skin. Research using laser imaging to track graft blood flow has shown that perfusion typically matches the control skin by day seven, exceeds it by day three weeks, and then stabilizes from there.
1PubMed Central. Postoperative Time and Anatomic Location Influence Skin Graft Reperfusion Assessed With Laser Speckle Contrast ImagingA healthy graft transitions from pale to pink over the first week, becomes increasingly adherent to the wound bed, and eventually takes on a color and texture closer to natural skin. When this process derails, the visual signs are usually obvious well before a surgeon confirms the diagnosis.
The Visual Stages of a Failing Graft
Graft failure tends to follow a recognizable visual trajectory, though it can move at different speeds depending on the cause. In the earliest phase, the graft may look deceptively normal or just a bit paler than expected. What sets off alarm bells is a graft that stays white, gray, or dusky blue past the first few days instead of pinking up. That persistent pallor means blood vessels are not growing into the tissue.
If the graft is failing from inadequate blood supply, the color often shifts from pale to a mottled blue-purple, then to dark brown or black as the tissue dies. The surface may become dry and leathery rather than moist and supple. You might notice that parts of the graft begin to curl at the edges or peel away from the wound bed entirely. When you press gently near a healthy graft, you can see the pink blanch and then return, much like pressing your fingernail bed. A failing graft does not blanch at all because there is no capillary blood flow to push out and let refill.
When infection drives the failure, the picture is different. The graft may initially look like it is taking, only to deteriorate rapidly. Greenish or yellowish discoloration underneath or around the graft is a classic sign, along with increasing redness and warmth in the surrounding skin. Foul-smelling, cloudy, or purulent drainage that was not present in the first day or two points strongly toward bacterial colonization. The graft itself may become boggy and soft, almost floating on a layer of pus rather than adhering to the wound.
Why Infection Is the Most Visually Dramatic Cause of Failure
Infection does not just kill grafts quietly. It actively destroys them. Among the bacteria most commonly responsible, Pseudomonas aeruginosa stands out for the sheer speed and completeness with which it can break down graft tissue. In one study of plastic surgery patients, nearly a quarter of all skin grafts were lost due to infection, with Pseudomonas found in about 58% of those infected cases. Pseudomonas infections were more aggressive than other bacterial causes and led to a reoperation rate over four times higher than other organisms.
2PubMed. Analysis of skin-graft loss due to infection: infection-related graft lossPseudomonas produces enzymes that dissolve tissue and creates a characteristic green pigment, so a failing graft with a greenish hue and rapid tissue breakdown is a strong clinical indicator of this particular pathogen. Animal studies have confirmed just how destructive it is: Pseudomonas aeruginosa can completely destroy skin grafts when allowed to colonize, though experimental approaches like bacteriophage therapy have shown potential to protect grafts from this damage.
3PubMed. Bacteriophage prevents destruction of skin grafts by Pseudomonas aeruginosaA larger observational study found that a positive bacterial culture after grafting was by far the strongest independent predictor of graft failure. In that cohort, patients whose grafts became infected had dramatically higher odds of failure compared to those who stayed clean, and gram-negative bacteria including Pseudomonas and Klebsiella were the most common culprits.
4PubMed Central. Split-thickness skin graft outcomes and associated risk factors in patients with skin defects at Al-Gumhouri hospital, Sana’a, Yemen: a prospective observational studyBurns and chronic vascular ulcers were especially prone to infection-related graft loss, with wound beds that are already colonized before the graft is placed posing the highest risk.
2PubMed. Analysis of skin-graft loss due to infection: infection-related graft lossPartial Failure Versus Complete Failure
Not all graft failures are total. In fact, partial failure is more common than complete loss. A graft might take successfully over 80% of its surface area while losing a small patch at the periphery or in a spot where a pocket of blood or fluid collected underneath. Visually, partial failure looks like islands of healthy pink tissue next to areas of dark or sloughing skin. The dead portions may separate on their own while the living parts continue to heal.
Reperfusion data supports this patchwork pattern. Studies measuring blood flow across grafts have found that the center of a graft tends to be better perfused than the periphery during the first three weeks after surgery, which helps explain why edges and corners are more vulnerable to failure.
1PubMed Central. Postoperative Time and Anatomic Location Influence Skin Graft Reperfusion Assessed With Laser Speckle Contrast ImagingPartial failure with less than about 20% tissue loss can sometimes be managed conservatively, letting the wound granulate and close on its own or with simple wound care. More extensive partial failure, or complete loss where the graft turns uniformly black and separates from the wound, usually means the patient needs regrafting.
How Common Is Graft Failure, and Who Is Most at Risk?
Graft failure rates vary widely depending on the location, the type of graft, and the patient’s underlying health. In one prospective study of lower limb skin grafts, roughly a third of grafts failed. The significant risk factors were peripheral vascular disease, higher body mass index, and use of immunosuppressant medications.
5PubMed Central. The Incidence and Risk Factors for Lower Limb Skin Graft FailureSmoking and diabetes also appear to increase the risk. One study found a 40% failure rate in smokers compared to about 30% in nonsmokers, and a 75% failure rate in patients with diabetes compared to roughly 32% in those without, though the diabetes numbers came from a small sample and the smoking association did not quite reach traditional statistical significance.
4PubMed Central. Split-thickness skin graft outcomes and associated risk factors in patients with skin defects at Al-Gumhouri hospital, Sana’a, Yemen: a prospective observational studyHeart failure adds another layer of risk. A weakened heart cannot deliver blood efficiently to the periphery, which means the wound bed may not receive the oxygen and nutrients a graft needs to survive. The resulting tissue swelling also creates a poor surface for the graft to adhere to, in much the same way that a hematoma or seroma forming under the graft can physically lift it away from the blood supply.
6Georgetown Medical Review. Major Risk Factors Contributing to Split Thickness Skin Graft FailureThe type of graft matters too. A meta-analysis comparing full-thickness grafts to split-thickness grafts at one particular donor site found that full-thickness grafts had nearly three times the odds of failure.
7PubMed Central. Comparison of split thickness skin graft versus full thickness skin graft for radial forearm flap donor site closure: A systematic review and Meta-analysisFull-thickness grafts include the entire dermis and demand more robust blood supply from the recipient bed, which is why they are more prone to failure when conditions are not ideal.
The Role of the Wound Bed
A skin graft is only as good as the surface it lands on. The wound bed must supply the blood vessels that will grow into the graft, so anything that compromises that vascular network puts the graft at risk. Exposed bone, tendon, or fascia without overlying tissue is particularly hostile territory for grafting because these structures have poor blood supply on their own. In such cases, surgeons often delay grafting until the wound bed has developed a healthier layer of granulation tissue, or they use other techniques like flap coverage instead.
8Journal of Burn Care & Research. 643 The Use of Topical Exogenous Nutrient Supplementation to Improve Graft Take on an Avascular Wound BedLocation on the body also plays a role in how well a graft takes and, consequently, what failure looks like. The face, with its rich blood supply, generally supports rapid graft reperfusion; studies show that facial grafts reach normal perfusion levels faster than grafts on the scalp or lower limbs.
1PubMed Central. Postoperative Time and Anatomic Location Influence Skin Graft Reperfusion Assessed With Laser Speckle Contrast ImagingThe lower leg is one of the most challenging areas for graft survival. Blood flow to the lower extremities is already lower than in other regions, and conditions like peripheral vascular disease further compromise it. Swelling from gravity and difficulty immobilizing the area also work against the graft. If you are watching a graft on your shin or ankle, a slower pinking-up process is expected compared to the face, but progressive darkening or persistent pallor past the first week warrants urgent attention.
Mechanical Disruption and What It Looks Like
Even a graft with perfect blood supply and no infection can fail if it gets knocked loose. The graft needs to stay in direct contact with the wound bed during those critical first days while new blood vessels form. Shearing forces from movement, a buildup of blood (hematoma) or fluid (seroma) underneath, or simply bumping the area can separate the graft from its lifeline.
Visually, mechanical failure often looks different from vascular or infectious failure. You may see parts of the graft lifted or tented up rather than lying flat. There might be visible swelling or a fluid collection underneath that gives the graft a raised, squishy appearance. The displaced section may initially still look pink because it has not been separated long enough to die, but without prompt intervention to drain the fluid and reattach the graft, that section will turn dusky and die over the following days.
Negative-pressure wound therapy, which uses a sealed dressing connected to a gentle vacuum, has proven effective at reducing this kind of displacement. In a randomized trial comparing vacuum-assisted dressings to traditional tie-over bolster dressings on irregular or high-movement areas, vacuum therapy reduced graft displacement significantly, with only one case of displacement in the vacuum group versus nine in the bolster group.
9PubMed. Negative-Pressure Wound Therapy Improves Take Rate of Skin Graft in Irregular, High-Mobility Areas: A Randomized Controlled TrialImmune Rejection in Donor Grafts
Most skin grafts use the patient’s own skin, harvested from one body site and moved to another. These autografts are not subject to immune rejection because the tissue is recognized as self. But when skin comes from another person, the body’s immune system can mount a vigorous attack against the foreign tissue. This is the reason cadaveric or living-donor skin grafts are used as temporary biological dressings rather than permanent solutions in most cases.
The rejection process involves the recipient’s immune cells recognizing foreign markers on the donor tissue’s cells and launching an inflammatory cascade that destroys the graft from within. Donor skin cells called dendritic cells migrate out of the graft into the recipient’s lymph nodes, where they trigger immune activation through two distinct pathways.
10PubMed Central. Immune recognition and rejection of allogeneic skin graftsA rejected allograft looks intensely red and swollen, then rapidly progresses to a dried, shrunken, brown-black eschar that lifts off the wound. The timeline is fast compared to other types of failure. An unsensitized recipient might reject a donor graft within one to two weeks, while someone who has had prior transplants or transfusions may reject it within days. This is expected and planned for in clinical practice; the temporary graft protects the wound while the patient stabilizes enough for a permanent autograft.
When to Contact Your Surgeon
Not every change in your graft’s appearance means it is failing, but certain signs justify a prompt call. Increasing pain after the first couple of days, rather than decreasing pain, is a red flag. A foul odor developing under the dressing, new redness spreading beyond the graft’s border into the surrounding skin, fever, or drainage that becomes thick and discolored all deserve immediate attention.
Color changes are the most informative visual cue. A graft that was looking pink and then develops new dark patches, or one that never progressed beyond white or gray by the end of the first week, should be evaluated. Surgeons generally assess grafts at scheduled intervals and may lift the dressing for a look at around day five to seven. Between those visits, photographing the graft daily in consistent lighting gives you a useful record that helps the surgical team see trends that a single snapshot might miss.
Does Age Affect What Failure Looks Like?
There is a common assumption that children heal better than adults and therefore have higher graft success rates. While children do tend to have faster overall healing, the evidence on graft take specifically is less dramatic than you might expect. One comparative study of early excision and grafting in burn patients found no significant difference in graft take between pediatric and adult groups, and scar outcomes were similar as well.
11PubMed Central. Comparison of the Results of Early Excision and Grafting between Children and Adults; A Prospective Comparative StudyOlder adults face different challenges. Aging skin is thinner, has a reduced blood supply, and heals more slowly. Elderly patients are also more likely to have the comorbidities that drive graft failure, such as diabetes, peripheral vascular disease, and chronic medication use including immunosuppressants and blood thinners. A failing graft in an older adult may look similar to one in a younger patient, but the timeline can be extended. Slow, insidious color changes over two weeks might replace the more dramatic shifts that happen over the first five to seven days in a healthier individual. The visual cues are the same in kind but sometimes subtler in degree, which makes vigilant monitoring even more important in this group.