An arterial ulcer is an open wound on the lower leg or foot caused by severely reduced blood flow through the arteries. When arteries narrow or become blocked, the tissue they supply starves for oxygen and nutrients, eventually breaking down into a wound that struggles to heal on its own. Most arterial ulcers trace back to atherosclerosis, the same process of artery-clogging plaque buildup responsible for heart attacks and strokes, but the consequences play out at the far end of the circulatory system, usually in the feet and toes.
How Arterial Ulcers Form
The underlying cause in most cases is peripheral artery disease, or PAD. PAD is atherosclerosis of the arteries in the lower limbs, and it often coexists with plaque buildup in the heart and brain vasculature as well.1PubMed Central. Peripheral artery disease in patients with diabetes: Epidemiology, mechanisms, and outcomes Over years, fatty deposits gradually narrow the arteries that deliver blood to the feet. In mild cases, people notice calf cramping when walking (called intermittent claudication) that eases with rest. As the disease progresses, blood flow drops so low that tissue at the extremities can no longer sustain itself. Skin breaks down, a wound forms, and the body lacks the circulation to mount a normal healing response. The result is an arterial ulcer.
Because gravity helps pull blood down to the feet, arterial ulcers often worsen when the legs are elevated and improve slightly when dangling. Researchers have found that patients with severe lower-limb ischemia experience pain relief when the leg hangs down, likely because the dependent position recruits capillaries that would otherwise remain closed.2PubMed. Capillary recruitment and pain relief on leg dependency in patients with severe lower limb ischemia This is the opposite pattern from a venous ulcer, where elevating the legs typically helps.
Major Risk Factors
Anything that accelerates atherosclerosis raises your risk of developing arterial ulcers. The biggest players are smoking, high blood pressure, diabetes, and elevated cholesterol. In a case-control study of smokers, cumulative tobacco exposure was directly tied to PAD risk: those in the highest category of lifetime pack-years had roughly 60% greater odds of developing peripheral arterial disease compared with lighter smokers. High systolic blood pressure (above 160 mmHg) increased the odds eightfold, and elevated apolipoprotein B (a marker of harmful cholesterol) nearly quadrupled the risk.3PubMed. Risk factors associated with the development of peripheral arterial disease in smokers: a case-control study
Diabetes deserves special mention because it does double damage. High blood sugar injures artery walls from the inside while also impairing the nerves that signal pain. A person with diabetic neuropathy may not feel a wound forming on a toe or heel until the ulcer is already established. That delayed detection, combined with poor circulation, makes diabetic arterial ulcers particularly dangerous.
Less commonly, arterial ulcers arise from nonatherosclerotic causes. Thromboangiitis obliterans (Buerger’s disease), an inflammatory condition almost exclusively seen in heavy tobacco users, can destroy small and medium arteries in the hands and feet. Systemic vasculitis, where the immune system attacks blood vessel walls, can also choke off circulation to the extremities and produce ischemic ulcers.4Circulation. Nonatherosclerotic arterial disorders of the lower extremities These rarer causes tend to affect younger patients who lack the traditional cardiovascular risk profile.
What Arterial Ulcers Look and Feel Like
Arterial ulcers have a distinctive appearance and set of symptoms that set them apart from other chronic wounds. The ulcer itself tends to be well-defined, almost as if a hole was punched through the skin, with sharp, regular borders. The wound bed is often pale, yellowish, or covered in necrotic (dead) tissue rather than the healthy pink granulation tissue you would expect in a normally healing wound. They favor spots where circulation is poorest and pressure or friction is greatest: the tips of the toes, between the toes, the heel, or over bony prominences on the foot and ankle.5PubMed Central. Venous and arterial leg ulcers
Pain is a hallmark. Unlike venous ulcers, which can be uncomfortable but are often tolerable, arterial ulcers frequently cause severe rest pain, especially at night when you are lying flat and gravity is no longer assisting blood flow to the feet. Many people find themselves sleeping in a chair or dangling the affected foot off the bed for relief. The surrounding skin gives additional clues: it often feels cool to the touch, looks shiny and taut, and may have lost its hair. Toenails may be thickened, brittle, or discolored. Pulses at the ankle or top of the foot are weak or absent.
How Doctors Diagnose Arterial Ulcers
A clinical exam that checks for absent pulses, cool skin, and the characteristic wound appearance usually raises suspicion. The standard first-line test is the ankle-brachial index, which compares blood pressure at the ankle to blood pressure in the arm. A low ratio suggests poor arterial flow in the legs. However, ABI has meaningful limitations. In a study of patients over 70 with lower-limb ulcers, the ankle-brachial index had a sensitivity of only about 55% and a specificity of around 68%. The toe-brachial index performed better for detecting arterial disease in that older population, catching about 80% of cases. The difference is explained by calcification of the lower-leg arteries, a common issue in elderly and diabetic patients that falsely inflates ankle pressure readings. Measuring pressure at the toe avoids this problem because the small arteries there are less prone to calcification.6PubMed. Evaluation of the ankle brachial index and toe brachial index for peripheral arterial disease diagnosis in patients over 70 years with lower limb ulcers
When revascularization is being considered, doctors often use additional tests to gauge tissue-level perfusion and predict whether a wound can heal after restoring blood flow. Two common measurements are skin perfusion pressure (SPP) and transcutaneous oxygen pressure (TcPO2). In a pilot study of patients with chronic limb-threatening ischemia, wound healing occurred when SPP reached at least 45 mmHg and TcPO2 reached at least 40 mmHg after treatment.7Annals of Vascular Diseases. A Pilot Study Investigating the Use of Regional Oxygen Saturation as a Predictor of Ischemic Wound Healing Outcome after Endovascular Treatment in Patients with Chronic Limb-Threatening Ischemia Imaging studies like duplex ultrasound, CT angiography, or catheter-based angiography can then map exactly where the blockages are and guide treatment planning.
How Arterial Ulcers Differ from Venous Ulcers
People sometimes lump all leg ulcers together, but arterial and venous ulcers arise from opposite circulatory problems and require different management. Venous ulcers result from blood pooling in the legs due to faulty vein valves; arterial ulcers result from blood not getting to the legs in the first place. The practical distinctions matter for treatment decisions:
- Location: Venous ulcers typically appear on the inner lower leg, above the ankle. Arterial ulcers favor the toes, heel, and bony prominences of the foot.
- Appearance: Venous ulcers tend to be shallow, irregularly shaped, and surrounded by discolored, thickened skin. Arterial ulcers are deeper, have well-defined edges, and sit in pale, dry skin.
- Pain pattern: Venous ulcers ache with prolonged standing and improve when you elevate the legs. Arterial ulcers hurt more at rest and improve when the leg hangs down.
- Compression: Compression bandaging is a cornerstone of venous ulcer therapy. Applying strong compression to an arterial ulcer can further restrict blood flow and make the wound worse, which is why ruling out significant arterial disease is essential before wrapping a leg ulcer.
Some patients, especially those with diabetes, develop mixed ulcers where both arterial and venous disease contribute. These cases are trickier because the standard treatment for one type can harm the other. Modified compression or sequential treatment may be necessary, and these patients generally need specialist input.
Treatment: Restoring Blood Flow
The core principle of arterial ulcer treatment is revascularization: physically restoring blood flow to the ischemic tissue. Without adequate circulation, no amount of wound dressings or topical therapy will heal the ulcer. There are two main approaches: endovascular procedures (using catheters, balloons, and stents inserted through a small puncture) and open bypass surgery (surgically grafting a new conduit around the blockage).
Research comparing these two strategies shows a nuanced picture. A meta-analysis of randomized controlled trials found that open bypass surgery led to fewer major adverse limb events, including fewer repeat procedures, compared with endovascular therapy. About 22% of endovascular patients needed major reinterventions versus about 13% of those who had open surgery. However, overall amputation-free survival was not significantly different between the two approaches.8Journal of Vascular Surgery Cases, Innovations and Techniques. Endovascular revascularization vs open surgical revascularization for patients with chronic limb-threatening ischemia: A systematic review and meta-analysis of randomized controlled trials
Another meta-analysis found that endovascular surgery actually had a lower amputation rate compared with open surgery, though limb salvage rates at one and three years did not significantly differ.9PubMed Central. Amputation and limb salvage following endovascular and open surgery for the treatment of peripheral artery illnesses: A meta-analysis The conflicting findings reflect real variability across patient populations, disease severity, and surgical expertise. In practice, the choice often depends on where the blockage is located, how extensive it is, and the patient’s overall health. Endovascular therapy is less invasive and has a faster recovery, making it attractive for patients who are frail or have significant surgical risks. Open bypass tends to be more durable for complex, long-segment blockages.
For patients on dialysis, the calculus shifts further. One study found that bypass surgery produced better limb salvage and wound healing rates in dialysis-dependent patients compared with endovascular therapy, while in patients not on dialysis the difference in limb salvage was not significant.10PubMed. Comparison of limb outcomes between bypass surgery and endovascular therapy in dialysis-dependent and -independent patients with chronic limb-threatening ischemia Dialysis patients tend to have heavily calcified arteries that respond poorly to balloon angioplasty and stenting, which may explain the advantage of surgical bypass in that group.
Medications and Wound Care
Revascularization addresses the mechanical problem, but long-term medical therapy is equally important. Antiplatelet drugs (like aspirin or clopidogrel) reduce the risk of clots forming on existing plaque, and statins do more than just lower cholesterol. In PAD patients, statins help stabilize plaques, reduce inflammation in the artery walls, and may even promote some regression of existing blockages.11Current Vascular Pharmacology. Current Evidence and Future Perspectives on Anti-platelet and Statin Pharmacotherapy for Patients with Symptomatic Peripheral Arterial Disease Blood pressure control and blood sugar management round out the medical regimen. These medications do not heal an ulcer directly, but they slow the progression of the underlying arterial disease and reduce the risk of heart attack and stroke, which is elevated in anyone with PAD.
Local wound care for arterial ulcers tends to be gentler and more conservative than for venous ulcers. Because blood supply is limited, the tissue has minimal capacity to regenerate, and aggressive cleaning or debridement of dead tissue can enlarge the wound without the circulation to support healing. Keeping the wound moist, protecting it from infection, and offloading pressure from the affected area (with specialized footwear or padding) are the standard principles. Once blood flow is restored through revascularization, the wound environment changes dramatically, and more active wound management becomes appropriate.
Hyperbaric Oxygen Therapy
Hyperbaric oxygen therapy (HBOT), where a patient breathes pure oxygen in a pressurized chamber, has been explored as an add-on treatment for difficult arterial ulcers. A systematic review found moderate evidence that HBOT promotes healing of arterial ulcers and certain other refractory vascular wounds.12PubMed. Hyperbaric oxygen therapy for wound healing and limb salvage: a systematic review The strongest evidence, however, applies to ischemic diabetic ulcers specifically. A meta-analysis of HBOT for diabetic foot ulcers with arterial insufficiency found that the therapy improved major amputation rates but did not significantly improve overall wound healing.13PubMed. A systematic review and meta-analysis of hyperbaric oxygen therapy for diabetic foot ulcers with arterial insufficiency For non-diabetic arterial ulcers, the evidence supporting HBOT remains more limited.14Advances in Skin & Wound Care. Hyperbaric Oxygen Therapy: Exploring the Clinical Evidence – Section: Arterial Insufficiency and Diabetic Wounds
HBOT is not a substitute for revascularization. It works by temporarily flooding tissues with oxygen, which may help fight infection and stimulate some healing activity, but if the arteries remain blocked, that benefit fades as soon as the sessions stop. Most vascular specialists consider it a potential adjunct for patients whose wounds are not responding despite adequate revascularization and optimal wound care, rather than a standalone therapy.
Arterial Ulcers in People with Diabetes
Diabetes is the single condition that complicates arterial ulcers most. Nerve damage reduces sensation, so wounds go unnoticed longer. High blood sugar impairs immune function, raising infection risk. And the pattern of arterial disease in diabetes tends to affect smaller arteries below the knee, making revascularization technically more challenging.
Outcomes in this group reflect these compounding difficulties. In a study of diabetic patients with ischemic or neuroischemic foot ulcers, only about 36% healed without additional surgery. Another 16% healed after a minor amputation (such as a toe), and 13% required a major amputation (below or above the knee). Perhaps most sobering, 27% died before their wound healed. The median time to healing was 27 weeks. Among surviving patients, roughly 72% ultimately healed without a major amputation, but that number includes those who lost toes or part of the foot along the way.15ScienceDirect. Factors related to outcome of neuroischemic/ischemic foot ulcer in diabetic patients
These figures underscore why prevention and early detection matter so much in the diabetic population. Daily foot inspections, properly fitted shoes, regular visits to a podiatrist, and aggressive management of blood sugar and cardiovascular risk factors are not optional extras. They are the difference between catching a problem when it is still manageable and facing a wound that threatens the limb.
Prevention and Lifestyle
Because atherosclerosis is the root cause in most cases, preventing arterial ulcers overlaps heavily with preventing cardiovascular disease. Quitting smoking is the single highest-impact change. Exercise matters too, and not just for general fitness. Structured exercise programs improve walking distance in people with PAD and can promote the development of collateral blood vessels that partially compensate for blocked arteries. Research in diabetic patients has shown that supervised exercise therapy improves several risk factors for foot ulceration within weeks and may help correct balance and gait problems that contribute to repetitive foot trauma.16PubMed Central. Diabetic foot and exercise therapy: step by step the role of rigid posture and biomechanics treatment
Foot care habits play a surprisingly large role. Wearing shoes that fit well, avoiding walking barefoot, moisturizing dry skin to prevent cracks, and trimming nails carefully all reduce the minor injuries that can become ulcers when circulation is compromised. For people already diagnosed with PAD, regular vascular check-ups allow doctors to track disease progression and intervene before ischemia reaches the point of tissue breakdown.
When Arterial Ulcers Become an Emergency
Chronic arterial ulcers develop gradually as blood flow declines over months or years. But acute limb ischemia is a sudden, dramatic cutoff of blood supply that demands emergency treatment. It can happen when a blood clot forms on top of existing plaque, when an embolus from the heart lodges in a leg artery, or when a bypass graft suddenly fails. Acute limb ischemia threatens limb viability and requires urgent evaluation.17PubMed Central. Acute limb ischemia
The classic warning signs are sometimes called the “six Ps”: pain, pallor, pulselessness, paralysis, paresthesia (tingling or numbness), and poikilothermia (the limb feels cold). In one case report, an elderly patient presented with worsening agitation and pain alongside coldness, pallor, and weakened pulses in both lower extremities, prompting emergency imaging.18Intercontinental Journal of Emergency Medicine. Bedside ultrasonography in diagnosing bilateral femoral arterial occlusion in an elderly patient with acute limb ischemia If you or someone you know with a known arterial ulcer suddenly develops much worse pain, numbness, or a leg that turns white or blue and cold, that is a call-the-ambulance situation, not a wait-for-the-next-appointment situation. Without rapid restoration of blood flow, permanent tissue damage and amputation become likely within hours.
Living with an Arterial Ulcer
The practical burden of an arterial ulcer goes well beyond the wound itself. Chronic ischemic pain disrupts sleep, limits mobility, and erodes mental health. Many patients find themselves in a cycle of clinic visits, wound dressing changes, imaging studies, and vascular procedures that stretches on for months. Studies of patients with chronic leg ulcers consistently identify pain as the strongest predictor of diminished quality of life, outweighing wound size, duration, and most other clinical variables. Smoking further compounds the quality-of-life burden in this population.19PubMed Central. Factors Associated With Quality of Life in Patients With Venous Leg Ulcers in a Community Setting: A Cross‐Sectional Study
Social isolation is common. Pain and limited mobility make it hard to maintain normal activities, and the wound itself can be a source of embarrassment or anxiety. People caring for an arterial ulcer at home should not underestimate the psychological toll. Asking for referrals to pain management, wound care nurses, or even counseling is reasonable and may make the difference between staying engaged with treatment and giving up on it. Arterial ulcers are serious, slow-healing wounds, but with appropriate vascular intervention, medication management, and attentive wound care, the majority of patients can achieve healing and preserve the affected limb.