Ischaemic skin ulcers are chronic wounds that form when blood cannot reach certain parts of your body, usually your legs and feet. These sores develop because tissues don’t receive enough oxygen and nutrients to stay healthy, causing cells to die and creating wounds that are often slow to heal and can become quite painful.

Understanding the Scope of Ischaemic Skin Ulcers

Ischaemic skin ulcers affect a significant portion of the adult population, particularly as people grow older. Research shows that about one percent of adults in the United States have some form of vascular ulcer, which is a wound caused by blood circulation problems. This number increases considerably with age, affecting between three and five percent of adults over 65 years old.^[1]

Among people dealing with lower leg wounds, ischaemic ulcers account for approximately eight to ten percent of all cases. The aging population is especially vulnerable to these wounds because multiple risk factors often occur together, creating a perfect storm that makes healing extraordinarily difficult.^[2]

Older adults face particular challenges because their bodies naturally experience changes in blood vessel health over time. When these age-related changes combine with other health conditions like diabetes or heart disease, the risk of developing an ischaemic ulcer increases substantially. The situation becomes even more serious because these ulcers can take weeks or even months to heal completely, requiring intensive medical care and patient commitment throughout the recovery process.^[3]

What Causes Ischaemic Skin Ulcers

The most common cause of ischaemic ulcers is narrowed arteries, a condition doctors call atherosclerosis. Atherosclerosis happens when fat, cholesterol, and other substances build up inside your artery walls, making the passages narrower. This narrowing acts like a partially blocked pipe, preventing a healthy supply of blood from flowing to your legs and feet.^[1]

When your tissues don’t receive enough blood, they cannot get the nutrients and oxygen they need to function properly. Without these essential supplies, cells begin to die, and the tissue becomes damaged. This damaged tissue struggles to heal, even from minor injuries that would normally recover quickly in someone with good circulation.^[2]

Several conditions can lead to the narrowed arteries that cause ischaemic ulcers. Peripheral artery disease (PAD), which can develop as a complication of diabetes, high blood pressure, and high cholesterol, is a major contributor. Other causes include heart disease, diseases that affect blood vessels in the brain, blood clotting disorders, and problems with veins that prevent blood from returning properly to the heart.^[2]

Conditions that cause inflammation in blood vessels, such as lupus, can also lead to ischaemic ulcers. Additionally, blockages in the lymph vessels, which normally help fluid drain from the legs, can cause fluid to build up and contribute to ulcer formation.^[1]

Sometimes an ischaemic ulcer develops when even a small injury occurs in an area with poor blood flow. The injury itself might be minor—something you wouldn’t normally worry about—but without adequate blood circulation to support healing, it can develop into a chronic wound. This is especially problematic for people with diabetes who also have nerve damage, because they may not feel the injury when it happens.^[1]

Risk Factors That Increase Your Chances

Anyone with poor circulation is at risk for developing ischaemic ulcers, but certain groups face higher risks than others. Smoking is one of the most significant risk factors because it directly damages and weakens artery walls, contributing to narrowed arteries and reduced blood flow. The connection between smoking and ischaemic ulcers is so strong that quitting smoking is considered one of the most important steps in both prevention and treatment.^[3]

People with diabetes face elevated risks for multiple reasons. Diabetes can damage both large and small blood vessels, a condition called microvascular disease, which affects the tiny capillaries that deliver blood to tissues. Diabetes can also cause nerve damage that makes it harder to feel pain or discomfort, meaning a person might not notice when shoes are rubbing against their skin or when a small cut has occurred.^[3]

High blood pressure and high cholesterol levels significantly increase the risk of ischaemic ulcers because both conditions contribute to atherosclerosis. People with chronic kidney disease are also more vulnerable, as this condition affects blood vessel health throughout the body.^[1]

Being overweight or obese places extra pressure on the legs and can impair circulation. Physical inactivity worsens the situation because movement helps blood flow through the legs. Having a family history of vascular disease suggests a genetic predisposition that may increase risk. Other risk factors include conditions that cause blood to clot too easily, certain medications, previous radiation treatment to the area, trauma, cancer, and simply getting older.^[3]

Recognizing the Symptoms

Ischaemic ulcers typically develop on the feet and legs, often appearing on the toes, heels, ankles, or the spaces between toes. These wounds have a distinctive appearance that helps doctors identify them. They often look “punched out,” with raised, well-defined edges that create a symmetrical, round shape. The wound itself is usually deeper than the surrounding healthy tissue.^[1]

The base of an ischaemic ulcer can appear dark red, yellow, gray, or black. Unlike typical cuts or scrapes, these ulcers typically do not bleed. The lack of bleeding is itself a sign of poor circulation—there simply isn’t enough blood flow to the area to cause bleeding. In deep wounds, you might even be able to see tendons through the opening.^[2]

The skin surrounding the ulcer often shows signs of poor blood supply. It may appear shiny, tight, dry, and hairless. Hair loss happens because hair follicles, like other tissues, need adequate blood supply to function. The affected limb may feel cool to the touch, and when you dangle your leg down off the side of a bed or chair, it may turn red. When you raise the leg up, it typically becomes pale and feels even cooler.^[1]

Pain is a common and often severe symptom of ischaemic ulcers. Many people experience aching pain in the foot or leg, which frequently worsens at night. This nighttime pain occurs because when you lie flat, gravity cannot help blood reach your feet. Many patients find themselves hanging their legs over the side of the bed or sleeping in a chair to relieve the discomfort, as the downward position helps gravity assist blood flow.^[1]

Some people also experience cramping pain in the backs of their legs or in their buttocks during exercise or walking. This pain, which occurs because muscles aren’t getting enough oxygen during activity, usually subsides with rest.^[2]

Additional warning signs include drainage from the ulcer, redness around the wound or extending up the leg, swelling, pain when moving the toes, skin blisters, fever over 101 degrees Fahrenheit (39 degrees Celsius), chills, and the development of gangrene (tissue death), which can be either wet or dry.^[3]

Prevention Strategies

Preventing ischaemic ulcers involves both protecting your feet and legs from injury and making lifestyle changes that improve blood circulation. If you’re at risk for these ulcers, daily foot checks are essential. Each day, examine the tops and bottoms of your feet, your ankles, heels, and the spaces between your toes. Look for any changes in color, red areas, or sore spots that might signal the beginning of a problem.^[1]

Proper footwear plays a crucial role in prevention. Shoes should fit properly without rubbing or putting pressure on your feet. Socks should also fit well—socks that are too large can bunch up inside your shoes and rub against your skin, potentially causing sores. Never walk barefoot, as this exposes your feet to injury. Protect your feet from cold temperatures, which can further reduce blood flow to already compromised tissue.^[1]

It’s important to avoid sitting or standing in one position for too long, as this can impair circulation. However, do not wear compression stockings or wraps unless specifically instructed by your healthcare provider, as these can actually restrict blood flow in people with arterial problems. Also avoid soaking your feet in hot water, which can cause burns in areas with reduced sensation.^[1]

Lifestyle modifications can significantly reduce your risk of developing ischaemic ulcers. Quitting smoking is perhaps the single most important change you can make, as smoking directly leads to narrowed arteries. If you have diabetes, keeping your blood sugar levels under control helps protect your blood vessels and improves your body’s ability to heal.^[1]

Exercise, as much as your healthcare provider recommends, helps improve blood flow throughout your body. Staying physically active encourages blood circulation in your legs. Eating healthy foods and getting plenty of sleep at night give your body the resources it needs to maintain healthy blood vessels. If you’re overweight, losing weight can reduce pressure on your legs and improve circulation. Managing your blood pressure and cholesterol levels is also critical, as both contribute to blood vessel health.^[1]

How Ischaemic Ulcers Change Normal Body Function

Understanding what happens in your body when an ischaemic ulcer develops helps explain why these wounds are so difficult to heal. The process begins in your arteries, the blood vessels responsible for carrying oxygen-rich blood from your heart to all parts of your body. When arteries become narrowed or blocked, the amount of blood that can flow through them decreases dramatically.^[2]

Blood carries more than just oxygen—it also transports essential nutrients, immune cells that fight infection, and the building blocks tissues need to repair themselves. When blood flow is restricted, tissues receive inadequate supplies of all these critical elements. The medical term for this reduced blood flow is ischaemia, which literally means “restriction of blood supply.”^[1]

As ischaemia continues, cells in the affected area cannot perform their normal functions. Without enough oxygen, cells switch to less efficient ways of producing energy, and eventually they begin to die. This cell death, called necrosis, damages the tissue and creates the foundation for an ulcer to form. Even a small injury in an area with poor blood supply cannot heal properly because the body cannot deliver enough repair materials to the site.^[2]

The microcirculation—the network of tiny blood vessels called capillaries that deliver blood to individual cells—becomes severely compromised in ischaemic conditions. In people with diabetes, the situation is even more complex because high blood sugar levels can damage these small vessels directly, a condition called diabetic microangiopathy. Problems with the microcirculation mean that even if larger blood vessels are functioning reasonably well, tissues still cannot get the blood they need.^[3]

The body’s natural healing response also becomes impaired. Normally, when tissue is injured, the body increases blood flow to the area, bringing in white blood cells to fight infection and special cells to rebuild damaged tissue. In an ischaemic ulcer, this healing response cannot function properly because the blood vessels simply cannot deliver enough blood. White blood cells arrive in insufficient numbers, making infections more likely and harder to fight off. The cells responsible for rebuilding tissue lack the materials they need to work effectively.^[2]

The location of ischaemic ulcers—typically on the feet and toes—makes the situation even more challenging. These areas are the farthest from the heart and are particularly vulnerable to reduced blood flow because blood must travel the greatest distance to reach them. Additionally, feet and lower legs are prone to swelling and pressure from standing and walking, which can further compromise already limited blood flow.^[2]

When pressure is placed on skin in an area with poor circulation, the tissue underneath can be damaged more easily than normal skin. Without adequate blood perfusion, the tissue cannot recover from this pressure damage. This explains why ischaemic ulcers often develop in locations where shoes rub against the foot or where bones create pressure points, such as the heel or the bony prominence on the inner ankle.^[3]

The wound environment itself creates additional problems. Because blood flow is so limited, the wound may not produce much drainage, and what drainage does occur may not contain enough of the substances needed for healing. The edges of the wound can become thick and hardened, creating a barrier that makes it even harder for any available blood to reach the damaged tissue. The base of the wound may become covered with dead tissue, which must be removed before healing can begin.^[3]

The pain experienced with ischaemic ulcers reflects the severity of tissue oxygen deprivation. Pain often worsens at night when the person is lying flat because this position makes it even harder for blood to reach the feet and toes. Gravity cannot assist blood flow when the body is horizontal. This is why many people with ischaemic ulcers instinctively dangle their legs off the bed—they’re allowing gravity to help pull blood down into their feet, providing some relief.^[1]