What Is A Varicose Ulcer? Causes And Treatment

A varicose ulcer is an open wound that forms on the lower leg when blood pools in damaged veins and the skin breaks down. It usually develops near the ankle, most often on the inner side of the leg, and it can take weeks or months to heal. These wounds are also called venous ulcers or venous stasis ulcers, and they are the most common type of leg ulcer in the United States.

They are not the same as a scrape or a cut. A varicose ulcer is a sign that the veins in the leg are not moving blood back to the heart efficiently. Without treatment, these wounds tend to grow, get infected, and return.

What Is A Varicose Ulcer? Causes And Treatment

A varicose ulcer forms when veins in the leg cannot push blood back up to the heart. Blood collects in the lower leg, pressure builds, and the skin and tissue near the ankle break down. The result is an open sore that leaks fluid and heals slowly.

The problem starts with the veins themselves. Veins have one-way valves that keep blood moving upward. When those valves weaken or the vein walls stretch, blood flows backward and pools. This is called venous insufficiency. Over time, the extra fluid and pressure damage the skin from the inside.

Several things raise the risk of this happening:

• Varicose veins or a history of them
• Deep vein thrombosis (a blood clot in the leg)
• Being over age 50
• Obesity
• Pregnancy
• Standing for long stretches at work
• A family history of vein problems
• Previous leg injury or surgery

One detail worth knowing: the ulcer is not caused by poor hygiene or a minor injury alone. It is the visible end result of a vein problem that has usually been building for years. Many people notice swelling, darkening skin, or heavy legs long before the wound appears.

What Does A Varicose Ulcer Look Like?

A venous ulcer typically appears as a shallow, open sore with uneven edges. The skin around it often looks discolored, ranging from red to brown or purple. This color change comes from red blood cells leaking into the tissue and breaking down over time.

Common features include:

• Location near the ankle, often on the inner side
• Swelling in the leg or ankle that worsens through the day
• Skin that looks shiny, tight, or scaly
• Fluid that drains from the wound
• Pain that may ease when the leg is raised

Not every leg wound is a varicose ulcer. Diabetic foot ulcers, pressure sores, and arterial ulcers can look similar but have different causes and need different care. An arterial ulcer, for example, comes from poor blood flow into the leg rather than pooling. This distinction matters because the treatments are not the same. A clinician can usually tell them apart with an exam and a simple blood flow test.

Why Do Varicose Ulcers Heal So Slowly?

Healing stalls because the underlying vein problem keeps working against the wound. Even as new skin tries to form, the pressure and fluid buildup continue to damage the area.

Three things slow the process:

• Poor circulation means less oxygen and fewer nutrients reach the tissue.
• Fluid buildup stretches the skin and keeps the wound open.
• Bacteria find a warm, wet environment that is easy to colonize.

This is why treating the wound alone rarely works. If the vein problem is not addressed, the ulcer may close and then reopen. Some people deal with the same wound coming back for years.

How Are Varicose Ulcers Treated?

Treatment has two goals: heal the wound and fix the vein problem underneath. The most important part of care is compression therapy, which applies steady pressure to the leg to help blood move upward instead of pooling.

Compression is not optional in most cases. Research consistently shows that compression improves healing compared with no compression. A clinician fits the patient with wraps, stockings, or a compression device. The right amount of pressure matters, so this is usually done by a wound care specialist rather than chosen at home.

Other parts of treatment may include:

• Cleaning and dressing the wound to keep it moist and protected
• Elevating the leg above heart level when resting
• Antibiotics only if there is a confirmed infection, not for routine care
• Debridement, which removes dead tissue so healthy tissue can grow
• Treating the underlying vein problem with procedures or surgery

Some clinicians also use skin grafts or specialized dressings for wounds that are not closing. The evidence for these varies by product, and no single dressing has been shown to heal all ulcers. What works best depends on the wound and the person.

Vein procedures, such as closing off or removing damaged veins, can lower the chance of the ulcer coming back. This is a decision made with a vein specialist. Surgery is not right for everyone, and it is usually considered after the wound is under control.

Can A Varicose Ulcer Be Prevented?

Prevention focuses on keeping blood moving in the legs. For people with vein disease, the same habits that help healing also help lower the risk of a new wound.

• Wear compression stockings if a clinician recommends them
• Raise your legs above heart level when sitting or lying down
• Move often — avoid standing or sitting still for long periods
• Stay active with walking, which helps the calf muscles push blood upward
• Keep a healthy weight to reduce pressure on the leg veins
• Check your legs and feet often for new sores or skin changes

If you already have vein disease, these steps are not a cure. They lower risk, but they do not replace medical care. Any new open sore on the leg should be checked by a clinician.

When Should You See A Doctor?

See a doctor for any open wound on the leg that is not clearly healing. Do not wait to see if it closes on its own. Early care makes a real difference.

Get medical help right away if you notice:

• A wound that is getting bigger or deeper
• Fever, chills, or worsening pain
• Red streaks spreading from the wound
• Pus, a bad smell, or heavy drainage
• A leg that is suddenly swollen, hot, or very painful

These can be signs of infection or a blood clot. Both need prompt care. An untreated leg infection can become serious quickly.

What Is the Outlook for a Varicose Ulcer?

With proper treatment, many varicose ulcers heal. Healing often takes weeks to months, and the timeline depends on the size of the wound, how long it has been there, and how well the vein problem is managed.

Recurrence is common. A large share of people who have one venous ulcer will develop another, which is why ongoing compression and follow-up care matter even after the wound closes. The evidence is clear that treating the underlying vein issue lowers the chance of the ulcer returning, though it does not remove the risk entirely.

The honest picture is this: a varicose ulcer is treatable, but it is a sign of a chronic vein condition. Managing that condition is a long-term job, not a one-time fix.