What Causes Dents in Your Legs & When to See a Doctor

Dents in the legs are most commonly caused by pitting edema, a condition where excess fluid accumulates in the tissue and leaves a visible indentation when you press on it. The cause behind that fluid buildup can range from something as harmless as standing all day to something as serious as heart or kidney failure. Less often, the dent has nothing to do with fluid at all; localized fat loss or skin changes from chronic vein disease can also leave depressions in the leg that look alarming but have entirely different explanations and treatments.

Why Pressing on a Swollen Leg Leaves a Dent

When fluid leaks out of tiny blood vessels faster than your lymphatic system can drain it away, the excess collects in the spaces between cells. That waterlogged tissue is soft enough that pressing a thumb into it displaces the fluid momentarily, leaving a pit that takes seconds to minutes to fill back in.¹ The pit forms because the leaked fluid has a relatively low protein concentration, so it moves around easily under pressure.² This is what doctors call pitting edema, and it is, by far, the most common reason people notice dents in their legs.

Non-pitting edema, by contrast, involves fluid with a higher protein content or tissue that has become thickened and fibrotic. Pressing on it doesn’t leave much of an indent. Conditions like lymphedema and advanced thyroid disease tend to produce non-pitting swelling, which feels firmer and looks different from the squishy, easily dented swelling of pitting edema. The distinction matters because the underlying causes and treatments are quite different.

Chronic Vein Problems Are the Most Common Culprit

If you have leg swelling that worsens through the day and improves overnight, the most likely explanation is chronic venous insufficiency. The valves inside your leg veins are supposed to push blood upward against gravity. When those valves weaken or fail, blood pools in the lower legs, pressure inside the veins rises, and fluid gets forced out into the surrounding tissue.¹ The result is puffy ankles and shins that pit when pressed.

Venous insufficiency tends to develop gradually. Early on you might only notice mild swelling after a long day on your feet. Over months or years, the swelling can become persistent. Visible varicose veins, skin discoloration around the ankles, and an aching heaviness in the legs are common accompanying signs. A randomized trial found that combining calf-strengthening exercises with graduated compression stockings significantly reduced disease severity in people with chronic venous insufficiency compared to stockings alone.³ This is worth knowing because it means that mild venous swelling often responds well to straightforward self-care, no prescription required.

Heart, Kidney, and Liver Disease

When pitting edema shows up in both legs at once and doesn’t have an obvious vein-related explanation, your doctor will start thinking about organs that regulate fluid throughout the body. Three major systemic conditions deserve attention.

Heart failure reduces the heart’s ability to pump blood efficiently. The body responds by activating hormonal systems that tell the kidneys to hold onto sodium and water, increasing blood volume in an attempt to compensate. That extra fluid eventually leaks into the tissues, showing up as swollen legs, shortness of breath, and fatigue.⁴ Heart-related edema often worsens at the end of the day and may be accompanied by swelling in the belly or difficulty breathing when lying flat.

Kidney disease can cause leg swelling through a different route. Healthy kidneys filter waste while keeping proteins like albumin in the blood. When the kidneys are damaged, albumin can spill into the urine in large amounts. Low blood albumin means less osmotic pull keeping fluid inside blood vessels, so it leaks out. One case report described a 45-year-old woman whose bilateral pitting leg edema progressed to the thighs; she turned out to have nephrotic-range protein loss in her urine and severely low albumin levels.⁵ Her edema kept worsening despite blood pressure treatment because the underlying kidney problem hadn’t been identified yet.

Liver cirrhosis triggers fluid retention through a related but distinct mechanism. Scarring in the liver raises pressure in the portal vein system and causes blood vessels throughout the body to dilate. The resulting drop in effective blood volume tricks the body into activating the same sodium- and water-retaining hormonal cascades seen in heart failure.⁶ People with advanced liver disease may notice swelling in the legs alongside a distended abdomen from fluid accumulation there.

Medications That Cause Leg Swelling

Sometimes the dents in your legs are a side effect sitting right there in the fine print of a prescription you already take. A review of drug-induced edema identified a long list of common offenders, including certain blood pressure medications (particularly the calcium channel blockers like amlodipine), diabetes drugs such as thiazolidinediones, nonsteroidal anti-inflammatory drugs, steroids, some nerve pain medications, and even insulin.⁷

Calcium channel blockers are probably the most frequent culprits in everyday practice. They relax blood vessel walls to lower blood pressure, but that relaxation also lets more fluid seep out of capillaries in the legs. The swelling is dose-dependent: a higher dose means more puffiness. If you started or increased a medication and then noticed new ankle swelling, that timing is a strong clue. Don’t stop any prescription on your own, but bringing it up with your doctor can lead to a dose adjustment or a switch to a different drug class that may fix the problem entirely.

When One Leg Suddenly Swells

A dent in one leg that appears rapidly, especially when the leg is also painful, warm, or red, raises concern for a deep vein thrombosis. A blood clot in a deep leg vein blocks normal blood flow, causing pressure and fluid to build up below the clot. This type of swelling is typically unilateral, distinguishing it from the bilateral puffiness of heart failure or kidney disease.⁸

Risk factors include recent surgery or immobilization, long-haul flights, cancer, pregnancy, and use of hormonal birth control. The reason DVT matters beyond the leg itself is that a clot fragment can break off and travel to the lungs, causing a pulmonary embolism. That is a life-threatening emergency. Sudden, unexplained swelling in one leg warrants same-day medical evaluation, and if you also develop chest pain or difficulty breathing, call emergency services.

Dents That Have Nothing to Do with Fluid

Not every indentation in the leg comes from swelling. Some people notice grooves or depressions in their thighs or shins that are not accompanied by puffiness at all. These can be caused by localized loss of the fat layer under the skin, a condition called lipoatrophy.

One well-documented form is lipoatrophia semicircularis, where horizontal, band-like depressions appear on the front or sides of the thighs. A case report described this in a person who developed bilateral semicircular depressions on both thighs after habitually wearing clothes with tight elastic bands during prolonged desk work. A biopsy confirmed that the fat cells in the area had simply shrunk, with no inflammation or scarring present.⁹ The condition has also been reported at sites of repeated drug injections. People who inject insulin, for instance, can develop either overgrown lumps or depressions at their injection sites.¹⁰ Similar localized fat loss has been documented with subcutaneous methotrexate injections in patients with autoimmune conditions.¹¹

Lipoatrophy dents look different from edema dents. They’re persistent, don’t change much with time of day, and you won’t be able to create a new pit by pressing your thumb into surrounding skin. The overlying skin usually looks and feels normal. If you’ve noticed a depression that stays exactly the same whether you’ve been on your feet all day or just woke up, fat loss rather than fluid is the more likely explanation.

Skin and Tissue Damage from Long-Standing Vein Disease

When venous insufficiency goes untreated for years, the chronically elevated pressure in leg veins starts to damage the skin and underlying tissue in ways that go beyond simple swelling. One result is lipodermatosclerosis, a condition where persistent vein pressure causes fibrin to deposit around the tiny capillaries in the skin. That fibrin layer blocks oxygen delivery to the tissue and stimulates fibrosis, gradually hardening and tightening the skin.¹²

In advanced cases the lower leg develops a characteristic “inverted champagne bottle” shape, with a narrowed, hardened ankle area and a wider upper calf.¹³ The skin may turn reddish-brown, feel woody to the touch, and develop painful tender areas. At this stage the leg can have visible dents and contour changes that are structural rather than fluid-based. Left unchecked, lipodermatosclerosis is a precursor to venous ulcers, open wounds on the lower leg that are notoriously slow to heal.

Another condition that can cause localized dents or thickened depressions in the skin is morphea, a form of localized scleroderma. Morphea involves chronic inflammation followed by fibrosis of the skin and sometimes the deeper tissue beneath it, including fat and fascia.¹⁴ It can appear anywhere on the body but commonly affects the trunk and limbs. Patches of thickened, waxy skin that may be lighter or darker than surrounding areas are the hallmark. When morphea affects deeper layers, it can cause visible indentations as the underlying fat or muscle atrophies. This is an autoimmune condition, and its presentation varies widely, so diagnosis usually requires a dermatologist.

Nutritional Causes

In much of the world, severe protein malnutrition remains a cause of leg edema, particularly in young children. Kwashiorkor, a form of malnutrition caused by inadequate protein intake despite relatively adequate calories, produces widespread pitting edema alongside low albumin levels and metabolic disruption.¹⁵ While full-blown kwashiorkor is rare in high-income countries, milder forms of protein deficiency can occur in older adults with poor appetites, people with severe eating disorders, or those recovering from major surgery with prolonged inadequate nutrition. When albumin levels drop, the body loses its ability to keep fluid inside blood vessels, and the legs and feet are among the first places where swelling shows up because gravity pulls the fluid downward.

How to Check Your Own Legs

If you’ve noticed dents, you can do a simple test at home. Sit down, expose your lower leg, and press the pad of your thumb firmly into the skin over your shin bone for about five seconds. Then release and watch what happens. If the skin bounces right back, you’re not dealing with significant pitting edema. If a dimple remains and takes several seconds (or longer) to fill in, that’s pitting edema.

Clinicians grade pitting edema on a scale based on how deep the pit is and how long it persists. A study validating a measurement tool defined the grades by depth: less than 2 mm is trace edema, 2 to 4 mm is grade 1, 4 to 6 mm is grade 2, 6 to 8 mm is grade 3, and anything deeper than 8 mm is grade 4.¹⁶ You don’t need to measure precisely at home, but the general idea is useful: a faint, quickly disappearing pit after a long day on your feet is very different from a deep pit that lingers for 30 seconds or more. The deeper and more persistent the pit, the more fluid is sitting in your tissue and the more urgently you should get it evaluated.

When to See a Doctor

Mild ankle swelling that appears after prolonged standing, sitting, or a salty meal and resolves overnight is extremely common and usually harmless. But several patterns should prompt a medical visit sooner rather than later.

Sudden one-sided swelling: Rapid swelling in a single leg, especially with pain, warmth, or redness, raises concern for a blood clot and warrants same-day evaluation.
Swelling with shortness of breath: Leg edema combined with difficulty breathing can indicate heart failure or, if acute, a pulmonary embolism. Seek urgent care.
Persistent bilateral swelling: Pitting edema in both legs that doesn’t resolve with elevation and has been present for more than a couple of weeks suggests a systemic issue with the heart, kidneys, or liver. Schedule an appointment with your primary care provider.
New swelling after starting a medication: If edema appeared within days or weeks of beginning a new drug, your doctor can evaluate whether the medication is responsible and consider alternatives.
Skin changes around the swelling: Darkened, hardened, or painful skin over swollen areas may signal advancing venous disease and should be assessed before it progresses to ulceration.
Unexplained depressions or grooves: Dents not associated with swelling, especially if they are growing or painful, deserve evaluation to rule out conditions like morphea or other tissue disorders.
Swelling with foamy urine or reduced output: Foamy urine suggests protein loss and possible kidney disease. Combined with leg swelling, this is a pattern your doctor will want to investigate with blood and urine tests.

A good rule of thumb: if the dent has been there for more than two weeks, if it’s getting worse rather than better, or if it came on suddenly with other symptoms, those are all reasons to get checked out. Your doctor will likely start with basic blood work, a urine test, and possibly an ultrasound of the legs or heart depending on the clinical picture. Catching the underlying cause early makes a meaningful difference in outcomes, particularly for heart, kidney, and vein-related causes where treatment can prevent the condition from spiraling.

Managing Mild Swelling on Your Own

For people whose leg swelling is mild and has been evaluated by a doctor without finding a worrisome cause, several practical strategies help keep fluid from pooling. Elevating the legs above heart level for 20 to 30 minutes a few times a day lets gravity work in your favor. Graduated compression stockings provide gentle external pressure that supports the veins and discourages fluid from leaking out. As noted earlier, combining compression with regular calf exercises produced significant improvements in disease severity for people with chronic venous insufficiency.³

Reducing sodium intake helps as well, because excess salt causes the body to retain water. Walking and moving the legs regularly throughout the day activates the calf muscle pump, which squeezes blood upward through the veins and reduces pooling. If your job requires hours of sitting or standing in one position, setting a reminder to move every 30 to 60 minutes can make a noticeable difference. And while these measures help with everyday venous and gravity-related swelling, they are not substitutes for medical treatment when edema is caused by a failing organ or a blood clot. If the swelling doesn’t respond to self-care, or if it keeps returning, circle back to your doctor for a closer look.

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PubMed Central. Clinical Perspectives and Management of Edema in Chronic Venous Disease—What about Ruscus?
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Osmosis. Pitting Edema · What Is It, Causes, Grading, Diagnosis, Treatment, and More
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PubMed Central. The Effects of Home-Based Strengthening Calf Muscle Exercise Program with Graduated Compression Stockings on Disease Severity, Muscle and Joint Function, and Quality of Life Among People with Chronic Venous Insufficiency: A Randomized Controlled Trial
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PubMed Central. Edema formation in congestive heart failure and the underlying mechanisms
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PubMed Central. Albuminuria Not Attributable to Diabetic or Hypertensive Kidney Disease: Adult-Onset Minimal Change Disease Presenting With Nephrotic Syndrome in a Woman With Prediabetes and Hypertension
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PubMed. Fluid retention in cirrhosis: pathophysiology and management
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PubMed Central. An old diagnosis resurfacing in times of lockdowns: A case of lipoatrophia semicircularis induced by elastic band use
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PubMed Central. Lipodystrophy in Insulin-Treated Subjects and Other Injection-Site Skin Reactions: Are We Sure Everything is Clear?
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PubMed. Semicircular lipoatrophy in a child with systemic lupus erythematosus after subcutaneous injections with methotrexate
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PubMed Central. Pericapillary fibrin in the ulcer-bearing skin of the leg: the cause of lipodermatosclerosis and venous ulceration
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PubMed Central. Morphea: The 2023 update
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PubMed Central. Quantitative measurement of pitting edema with a novel edema ruler