What Do Leg Ulcers Look Like When They Start?

What does a leg ulcer look like when it starts? In our experience, early leg ulcers often appear as small, shallow open sores on the lower leg or near the ankle that do not heal after a minor injury. The skin may look red or darker than usual, feel itchy or tight, and show skin discoloration or hardened skin around the area as poor blood circulation and high venous pressure affect the tiny blood vessels responsible for healing. At this stage, the ulcer may ooze clear fluid, feel tender, and be surrounded by swelling or aching in the legs.

At CACVI, our venous ulcer specialists bring over 30 years of experience diagnosing and treating venous leg ulcers, chronic wounds, and vein-related conditions before they lead to serious complications. We recommend seeking early evaluation by a vascular specialist because timely care can improve blood flow, prevent infection, and reduce the risk of ulcers being left untreated. Contact us now for a consultation!

This post will cover in detail the causes of leg ulcers, their progression, and available treatment options. It will also discuss how early detection can prevent serious complications.

What Are Leg Ulcers?

Leg ulcers are open sores or wounds that develop on the skin of the lower legs due to poor circulation. They occur when blood flow is restricted or compromised, preventing the body from healing naturally. There are different types of leg ulcers, including venous ulcers, arterial ulcers, and diabetic ulcers.

Venous leg ulcers are the most common type of leg ulcer. They develop near the ankles and often result from poor circulation caused by conditions like chronic venous insufficiency or varicose veins when blood does not flow properly from the legs back to the heart. The affected area may become shiny, and if untreated, the skin breaks down, leading to an open sore. These ulcers can be slow to heal and often require treatment like compression therapy or minimally invasive vein treatments such as endovascular ablation or sclerotherapy.

On the other hand, arterial ulcers are caused by arterial diseases such as peripheral artery disease (PAD). These venous ulcers occur when blood flow to the lower legs is reduced. They often appear on the feet or toes and are more painful than venous ulcers. Arterial ulcers tend to be more painful than venous ulcers, particularly when the leg is elevated. The skin surrounding the ulcer may appear cold, pale, or blue, and the wound edges are often sharply defined.

When it comes to diabetic ulcers, they occur due to poor circulation and nerve damage associated with diabetes. They are commonly found on the feet and are a serious concern for people with uncontrolled blood sugar. Untreated diabetic ulcers can lead to severe infections, tissue death (gangrene), and even amputation.

Causes and Risk Factors of Leg Ulcers

One of the most common causes we see is chronic venous insufficiency and related vein conditions such as varicose veins. These conditions cause blood to pool in the leg veins, leading to high venous pressure, leg swelling, skin discoloration, and eventually venous leg ulcers. In contrast, vascular conditions like peripheral artery disease reduce blood supply to the legs, resulting in arterial ulcers, which tend to be more painful and linked to severe circulation issues.

“Leg ulcers are often a sign of an underlying vascular problem rather than just a skin issue,” explains Dr. Vasim Lala. “When damaged veins or arteries limit blood flow, the body’s natural wound healing ability is compromised, allowing small wounds to progress into chronic ulcers if not addressed early.”

Diabetes is another major cause, as persistently high blood sugar can damage tiny blood vessels and nerves, slowing wound healing and increasing the risk of chronic leg ulcers. We also see ulcers develop after trauma such as a bump or cut when circulation is already impaired and the skin cannot repair itself properly. Over time, these wounds may deepen, affect surrounding tissues, and become infected if care is delayed.

Certain risk factors significantly increase the likelihood of ulcers forming. These include obesity, smoking, high blood pressure, prolonged standing, older age, and conditions that damage blood vessels or raise venous pressure. Excess weight places added strain on the veins, smoking restricts blood vessels, and long hours on your feet can worsen venous insufficiency. Each contribute to skin breakdown in the lower leg.

We always emphasize that early detection is important. Untreated ulcers can lead to serious complications such as infection, tissue death, delayed wound healing, and in severe cases, amputation. That’s why we recommend paying attention to early skin changes and learning the red flags for venous insufficiency. Early evaluation by a vascular specialist can help prevent ulcers from worsening and support long-term healing.

What Areas Are Most Affected?

In our experience, leg ulcers most commonly start on the lower leg, especially around the ankle, and this is strongly supported by national health data. According to the National Institutes of Health (NIH), venous leg ulcers typically form below the knee, most often near the medial (inner) ankle, where high venous pressure, damaged leg veins, and poor blood circulation make wound healing difficult. This area is particularly vulnerable in people with chronic venous insufficiency, varicose veins, leg swelling, or a history of prolonged standing, because blood struggles to return upward, leading to skin breakdown and open sores.

A good example from our own practice involved a patient in her early 60s who came to us with what she thought was a “small sore” just above her ankle. She had long-standing varicose veins and swollen ankles, but no major injury; just a minor scrape that never healed.

Over a few weeks, the area developed skin discoloration, hardened skin around the wound edges, and light fluid drainage. Once evaluated, it was clear the ulcer’s location and appearance were classic for an early venous leg ulcer, and prompt compression therapy, wound care, and vein treatment helped prevent infection and progression into a chronic wound.

This pattern is also reinforced by another major authority, MedlinePlus (U.S. National Library of Medicine), which explains that most venous ulcers develop on the lower leg or inner ankle, while arterial ulcers tend to appear on the feet or toes where blood supply is more severely reduced. MedlinePlus also notes that venous ulcers make up the majority of chronic leg ulcers, particularly in older adults and those with venous insufficiency or varicose veins.

Early Signs: What Does a Leg Ulcer Look Like When It Starts?

The early signs of a leg ulcer are often subtle and easy to dismiss, which is why many patients ask what does a leg ulcer look like when it starts only after symptoms worsen. Early leg ulcers usually begin with skin changes and sensations rather than a deep wound, and catching these signs early can significantly improve the wound healing process and reduce the risk of serious complications.

Let’s take a look at other early signs of leg ulcers:

Initial Sensations

One of the earliest signs we see is persistent itching, burning, or aching around the lower leg or ankle. Many patients also notice leg swelling, especially around the ankles, caused by excess fluid building up due to poor blood circulation and high venous pressure. Mild pain or tenderness can follow, particularly at the end of the day when legs are aching after prolonged standing or sitting.

“Early symptoms like itching, swelling, or discomfort are often the body’s first warning that blood flow in the leg veins isn’t adequate,” explains Dr. Vasim Lala. “These sensations may seem minor, but they frequently precede the formation of venous leg ulcers.”

Clinical data supports this pattern. According to NIH-supported research, venous leg ulcers account for about 60–80% of all chronic leg ulcers, and many begin with swelling and discomfort before the skin breaks down .

Skin Changes

As the ulcer begins to develop, noticeable skin changes such as skin discoloration can occur. You would see patches of skin turn to red, purple, or brown due to poor blood flow. These discolorations are particularly common in venous ulcers and can appear in areas affected by chronic venous insufficiency. 

The skin may also begin to thicken or harden, a condition known as lipodermatosclerosis. This indicates long-standing venous disease. Furthermore, the skin might become dry or scaly, and in some cases, the area can feel rough or flaky.

When swelling intensifies, the skin may take on a shiny or stretched appearance. This signals that the tissue beneath is not receiving enough oxygenated blood.

Visual Appearance of Early Leg Ulcers

When a leg ulcer first appears, it often looks like a small, shallow sore or an area of broken skin that may be mistaken for a scratch or minor injury. In venous ulcers, this usually happens on the inner lower leg near the ankle, where venous pressure is highest and ulcers most commonly form. The wound may have irregular edges, ooze clear fluid, or look wet and shiny due to excess fluid leaking from surrounding tissues.

“Early venous ulcers are often shallow with irregular borders and may weep fluid,” says Dr. Vasim Lala. “At this stage, prompt wound care and compression therapy can dramatically improve healing and prevent the ulcer from becoming chronic or infected.”

A common example we see is a patient who notices a small sore above the ankle after a minor bump. Because there’s little pain at first, they ignore it until swelling increases, the skin darkens, and the wound begins to ooze. With early intervention, including compression stockings, leg elevation, and targeted venous ulcer treatment, many of these early ulcers heal without progressing to chronic wounds. For visual reference, check out our leg ulcer pictures. 

How Long Does it Take for a Leg Ulcer to Form?

The time it takes for a leg ulcer to form can vary based on underlying conditions such as chronic venous insufficiency, diabetes, or arterial disease. Generally, a leg ulcer can form in 4-6 weeks, depending on the severity of poor blood flow and the presence of risk factors.

In the case of venous ulcer, prolonged venous insufficiency can cause skin changes and eventually lead to an ulcer if not treated early. The skin may show signs of damage like discoloration and hardening for several weeks before breaking down into an open wound. However, for individuals with conditions like diabetes or arterial disease, ulcers can form more quickly, especially if there is trauma or injury involved.

Venous Ulcers vs Arterial Ulcers in Early Stages: What is the Difference?

Venous Ulcers are typically caused by chronic venous insufficiency and poor blood flow back to the heart. In the early stages, they usually form on the lower legs, especially around the ankles. The skin may appear discolored (red, purple, or brown), and there may be swelling, itching, or leg pain. The ulcer itself tends to be shallow with irregular edges and may leak fluid.

On the other hand, arterial ulcers are caused by poor blood supply to the legs due to conditions like peripheral artery disease (PAD). The early signs include cool, pale or blue-tinted skin and pain in the area, especially when walking or at night. These ulcers are typically found on the feet, toes, or pressure points and tend to be deep with a well-defined, punched-out appearance and minimal fluid leakage. 

Telling the difference between venous ulcers and arterial ulcers early on can be challenging, but it’s critical, because the treatment approach depends on the underlying circulation problem. While both may start as small wounds, their location, appearance, and symptoms often point to very different causes.

Here’s a table with clear differentiation:

Feature	Venous Ulcers (Early Stage)	Arterial Ulcers (Early Stage)
Primary cause	Chronic venous insufficiency causing poor blood return and high venous pressure	Arterial disease or peripheral artery disease reducing blood flow to the legs
Typical location	Lower leg, most often near the inner ankle (gaiter area)	Feet, toes, heels, or outer ankle where blood supply is poorest
Early appearance	Small, shallow wounds with irregular edges; skin may look red, purple, or brown	Small but deeper-looking sores with well-defined edges; skin often pale or bluish
Skin changes around ulcer	Skin discoloration, hardened skin, swelling, stasis dermatitis, itchy or flaky skin	Thin, shiny skin; hair loss on legs or feet; cool skin temperature
Moisture level	Often oozes fluid or looks wet due to excess fluid and venous pressure	Usually dry with little or no drainage
Pain level at onset	Mild to moderate discomfort, heaviness, or aching that improves with leg elevation	Severe pain, especially at night or when legs are elevated
Leg swelling	Common, especially around ankles	Usually minimal swelling
Response to elevation	Symptoms often improve with leg elevation and compression therapy	Pain may worsen when legs are elevated
Circulation findings	Poor venous return but arterial pulses usually present	Reduced or absent pulses due to poor circulation
Associated vein/artery signs	Varicose veins, enlarged veins, chronic leg swelling	Signs of arterial disease, high blood pressure, smoking history
Early treatment focus	Compression therapy, wound care, improving venous blood flow	Restoring arterial blood flow; compression often not recommended

 

How to Differentiate Between Early Leg Ulcers and Other Skin Conditions

In our experience, one of the biggest challenges patients face is knowing whether a skin change is an early leg ulcer or another common skin condition. Early ulcers can look deceptively mild at first, and it really depends on the underlying cause rather than just how the skin looks on the surface. Understanding the key differences can help you decide when to monitor, when to treat, and when to seek medical attention.

Take a look at the table below:

Condition	Typical Appearance	Common Symptoms	How It Differs From a Leg Ulcer
Early Leg Ulcers (Venous or Arterial)	Small, shallow open sores or areas of skin breakdown; irregular edges; often near the ankle or lower leg	Itching, aching, swelling, mild to worsening pain, fluid oozing	Ulcers do not heal, tend to worsen over time, and are linked to poor blood flow or venous insufficiency
Cellulitis	Red, swollen, warm skin with no open sore at first	Pain, tenderness, fever, rapid spreading redness	Cellulitis is an infection of the skin, not a wound; it spreads quickly and usually responds to antibiotics
Eczema (Dermatitis)	Dry, scaly, itchy patches; may crack but usually not open sores	Intense itching, irritation, dryness	Eczema typically improves with topical treatments and doesn’t cause deep tissue breakdown
Diabetic Foot Ulcers	Small wounds or callused areas, often on the sole of the foot or toes	Reduced pain due to nerve damage, numbness	Usually linked to diabetes and nerve damage, not venous pressure or ankle swelling
Minor Skin Injuries	Scratches, cuts, or bruises	Mild pain, redness	Heal within 1–2 weeks and don’t progressively worsen

When to See a Vein Specialist for a Leg Ulcer

Knowing when to see a vein specialist for a leg ulcer can make the difference between a wound that heals and one that turns into a chronic, hard-to-treat condition. Early action matters, especially because leg ulcers are often a sign of deeper circulation problems rather than just a surface skin issue.

Here’s a step-by-step guide:

• Step 1: Watch for Red-Flag Changes: We recommend seeking specialist care right away if you notice increasing pain, a wound that is spreading or deepening, or skin around the ulcer becoming red, warm, or swollen. Other warning signs include green or foul-smelling discharge, worsening leg swelling, severe pain, or skin discoloration. These can signal infection or poor blood flow that needs urgent attention.

• Step 2: Don’t Ignore a Wound That Isn’t Healing: A key rule we share with patients is this: if a sore on your lower leg hasn’t improved after 2–4 weeks, it’s time to seek treatment. Leg ulcers that don’t heal often indicate chronic venous insufficiency, damaged veins, or arterial disease, and delaying care increases the risk of infection, tissue damage, blood clots, and chronic wounds that are much harder to treat later.

• Step 3: Understand the Risks of Delaying Treatment: It’s tempting to “wait and see,” but untreated ulcers can quickly worsen. In our experience, delayed treatment can lead to bacterial infection, severe pain, hardened skin around the wound, slowed wound healing, and in extreme cases, tissue death or the need for more invasive interventions. Early evaluation helps prevent these serious complications.

• Step 4: Know What a Vein Specialist Can Do: A vein specialist or vascular specialist looks beyond the surface wound to identify the root cause. This often includes a physical exam and vascular ultrasound to assess blood flow, vein function, and underlying venous insufficiency or arterial disease. From there, treatment may include compression therapy, wound care, leg elevation, and when appropriate, minimally invasive vein treatments to improve circulation and support healing.

• Step 5: Act Early for Better Outcomes: We’ve seen that patients who seek care early often heal faster and avoid chronic leg ulcers altogether. If you’re unsure whether your symptoms warrant specialist care, we recommend scheduling an evaluation sooner rather than later. Early intervention protects healthy tissue, improves blood flow, and gives your body the best chance to heal properly.

What Can Happen If You Delay Treatment?

Delaying treatment for leg ulcers can lead to severe complications, such as infections, as open ulcers can become infected. This then leads to painful skin infections like cellulitis or, in severe cases, septicemia. Delaying treatment of leg ulcers can also lead to impaired mobility.

Prolonged poor blood flow can cause further damage to the surrounding tissues. When blood flow is restricted for an extended period, the tissues in the affected area are deprived of essential oxygen and nutrients. This lack of nourishment weakens the skin and underlying tissue, making the skin and underlying tissue more prone to injury, breakdown, and infection. This delays the wound-healing process and increases the risk of complications like gangrene.

How to Treat Leg Ulcers?

Proper wound care is helpful for healing leg ulcers. This includes cleaning the ulcer regularly to prevent infection and applying special ulcer dressings to protect the wound and ensure a moist healing environment. Debridement is also helpful for wound care as it involves removing dead or damaged tissue to encourage new and healthy tissue growth. 

Another leg ulcer treatment is wearing compression stockings. These compression bandages are often prescribed for venous ulcers to improve blood flow and reduce leg swelling. Compression therapy helps prevent blood from pooling in the leg veins, which is a common issue with chronic venous insufficiency. 

You can also treat leg ulcers with topical or oral medications. They may be prescribed to treat infection, reduce inflammation, or improve circulation. 

For ulcers caused by varicose veins or chronic venous disease, treatments like sclerotherapy or endovascular ablation are effective in improving blood flow. These procedures work by closing off or removing faulty veins, which helps prevent blood from flowing backward and pooling in the legs.

Additionally, there are some new treatments for leg ulcers like biologic dressings, skin grafts, and endovascular procedures that help to speed up wound healing. Biologic dressings help promote faster healing by providing a moist environment for the wound and encouraging tissue regeneration, while skin grafts serve as a protective covering and promotes the regeneration of healthy tissue in the ulcerated area.

Worried About Leg Ulcers?

Early signs of leg ulcers include itching, swelling, and skin discoloration. Recognizing these early signs helps to prevent further complications as early detection and treatment can help to avoid severe issues like infection, delayed healing, or even loss of mobility. 

If you notice any of these symptoms, do not wait. Instead, seek medical advice from a vascular specialist to address potential concerns early and promote proper wound healing.

At our Center for Advanced Cardiac and Vascular Interventions in LA, we have expert vascular specialists ready to take care of you. Contact us today! 

FAQs

These are some of the most common questions patients ask when they first notice early skin changes or discomfort in their legs. While every case is different, the answers below can help you understand what’s normal, what depends on the underlying cause, and when to seek treatment.

How Quickly Do Leg Ulcers Develop After Symptoms start?

It depends on circulation and underlying vein or artery health, but leg ulcers can develop over weeks to months after early symptoms like swelling, itching, or skin discoloration appear. In people with chronic venous insufficiency or poor blood flow, progression can happen faster if symptoms are ignored.

Can Leg Ulcers Heal On Their Own?

In some cases, very early ulcers may improve with proper wound care, leg elevation, and compression therapy, but most do not fully heal without treatment. In our experience, ulcers left untreated often worsen and become chronic wounds that are much harder to heal.

When is Leg Ulcer Pain a Medical Emergency?

Severe or rapidly worsening pain, especially when accompanied by spreading redness, fever, foul-smelling discharge, or swelling in one leg, should be treated as urgent. These symptoms may signal infection, poor circulation, or serious complications that require immediate medical attention.

What Lifestyle Changes Help Prevent Leg Ulcers?

Maintaining a healthy weight, staying physically active, wearing compression stockings, and avoiding prolonged standing can significantly reduce your risk. We also recommend managing blood pressure, elevating your legs regularly, and addressing vein problems early to support long-term circulation and skin health.

✓ Medically reviewed by

Dr. Moinakhtar Lala

M.D., FACC, FSCAI, RPVI · Limb salvage and endovascular intervention

Built the limb salvage and amputation prevention programme at CACVI, which is why patients call him the leg saver. Board certified in general cardiology, endovascular interventions, echocardiography, nuclear cardiology and vascular ultrasound.

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Board certification verifiable through the American Board of Internal MedicineLast reviewed September 2026