Causes, Diagnosis & Treatment For Sock Marks On Legs - Healthline

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What Does It Mean If You Have Sock Marks on Your Legs?

Medically reviewed by Elaine K. Luo, M.D. — Written by The Healthline Editorial Team on September 3, 2019

Symptoms
Causes
One leg only
Diagnosis
Treatment
Outlook
Bottom line

Sock marks are caused by pressure from the elastic. Excess fluid in your body that’s pulled into your legs by gravity can make the marks more noticeable.

Peripheral edema can cause sock marks on your legs.

Sock marks on your legs are very common. Most socks contain elastic to keep them from slipping down. Pressure from the elastic leaves a mark.

The marks may be more noticeable if the soft tissue in your legs is swollen with fluid. This is called peripheral edema.

Most of the time, peripheral edema develops because you’re retaining fluid. Often the swelling is mild, goes away on its own, and isn’t associated with other symptoms.

Sometimes peripheral edema is more severe, however. This may indicate it’s caused by an underlying medical condition. When it is, there are usually other symptoms, and the edema doesn’t improve without treatment.

When peripheral edema is more serious
When other symptoms occur with peripheral edema, you might have a serious medical condition that requires urgent medical attention. Worrisome symptoms and their possible causes include:
chest pain: heart failure
dizziness or fainting: heart failure
shortness of breath, especially when lying flat: heart failure
swelling in only one leg: deep venous thrombosis (DVT), caused by a blood clot in a vein, or cellulitis
sudden onset of painful swelling in your calf: DVT
little urine production: kidney disease
abdominal swelling: liver disease
abdominal pain: tumor
sudden high blood pressure during pregnancy: preeclampsia

Peripheral edema that’s moderate to severe, getting worse, or doesn’t improve with rest is more serious. It should be evaluated by your doctor, especially if you have other symptoms or a history of heart, liver, or kidney disease.

What are the symptoms of peripheral edema?

Peripheral edema is divided into two types based on what happens when you press on the swollen area:

pitting edema, in which a dimple or “pit” persists when you stop pressing
nonpitting edema, in which the dimple immediately disappears when you stop pressing

Sock marks are more likely if you have pitting edema.

Other symptoms of peripheral edema include:

tight, shiny skin
redness
fluid oozing from the skin (if severe)

What causes peripheral edema?

Most often, peripheral edema is the result of fluid retention rather than an underlying condition. The swelling is usually mild and temporary.

Dependent edema

When you stand or sit for long periods throughout the day, gravity pulls blood into your legs. The increased pressure pushes fluid from the blood vessel into the soft tissue, causing mild swelling.

Swelling related to gravity is called dependent edema. It’s more pronounced at the end of the day, which is why sock marks are typically worse in the evening. They are usually gone by morning.

Salt

Eating lots of salt makes your body retain water. This leads to peripheral edema, which may cause more noticeable sock marks the next evening.

Hormonal changes

Hormone levels change throughout a woman’s menstrual cycle. This can cause water retention and leg swelling the week before menstruation.

Pregnancy

As it enlarges, a pregnant woman’s uterus can push on the blood vessels leading to her legs. This slows the movement of blood from her legs up to her heart, which can lead to peripheral edema.

Most pregnant women get peripheral edema, but it can also be a sign of a serious condition called preeclampsia. Other symptoms are the sudden onset of high blood pressure and protein in your urine (proteinuria). It requires urgent medical attention.

Heat edema

Peripheral edema often occurs in hot weather. Heat causes your blood vessels to open wider, so more blood pools in your legs. If fluid leaks into the tissue, edema develops.

Obesity

Being obese can cause excess fat in your abdomen and pelvis to push on blood vessels, slowing blood flow out of your legs. It accumulates in your leg veins, and the increased pressure pushes fluid into the soft tissue.

Peripheral edema caused by an underlying medical condition is generally more severe and doesn’t go away without treatment.

Venous insufficiency

One-way valves in your veins keep blood from backing up into your legs instead of moving toward your heart.

These valves can get weak and start to fail with age. Blood then backs up in your leg veins and leads to peripheral edema. This condition is called venous insufficiency. It can make your legs cramp or ache.

Congestive heart failure

Congestive heart failure develops because your heart is weak or damaged and can’t pump blood efficiently. Blood and fluid back up into your legs and sometimes your lungs (pulmonary edema).

Other symptoms include rapid weight gain and shortness of breath.

Kidney disease

With kidney failure, your body can’t remove enough fluid, so it builds up in your tissues — especially your legs. Swelling around your eyes (periorbital edema) is also common.

Liver disease

Diseases like hepatitis and alcoholism can scar your liver (cirrhosis), making it harder for blood to pass through this organ.

As a result, blood backs up into your lower body, and fluid accumulates in your abdomen (ascites) and legs. You may also develop yellow eyes and skin (jaundice).

Malnutrition

The blood level of a protein called albumin is low when you’re malnourished. Albumin helps keep fluid in your blood vessels. Without it, fluid leaks into the soft tissue.

Certain medications

Some medications can cause peripheral edema, including drugs for:

contraception: estrogen-containing birth control pills
diabetes: rosiglitazone (Avandia), pioglitazone (Actos)
high blood pressure: calcium channel blockers, such as amlodipine (Norvasc) and nifedipine (Adalat CC, Afeditab CR, and Procardia XL)
inflammation: nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen (Advil)
Parkinson’s disease: pramipexole (Mirapex)
seizures: gabapentin (Neurontin)

What if only one leg has sock marks?

Peripheral edema in only one leg is never normal and requires urgent medical attention. Causes include:

DVT

A blood clot in your leg vein is called a deep vein thrombosis, or DVT. It causes sudden pain and swelling, usually in your calf.

Without prompt treatment, the clot can break off and travel to your lungs. This is called a pulmonary embolism and can be life-threatening.

Cellulitis

Infected skin or soft tissue (cellulitis) is usually swollen. It may also be red, warm, and tender. Prompt treatment is necessary to prevent the infection from spreading to your bloodstream or bone.

Lymphedema

Lymph, fluid containing white blood cells, flows through your lymph nodes and special channels throughout your body.

Lymphedema develops when a tumor or other mass pushes on and blocks lymph channels, or when lymph nodes are surgically removed or damaged by radiation therapy. Your leg swells when the nodes or channels in your pelvis are involved.

How is peripheral edema diagnosed?

Your health history and a physical exam will give your doctor clues about the cause of your leg swelling, but tests are often needed for the diagnosis.

The test is chosen based on the organ being evaluated.

blood tests, which evaluate the function of most organs, including your heart, liver and kidneys, and albumin level
urinalysis, which assesses kidney function
chest X-ray, an imaging test that assesses your lungs and heart
electrocardiogram, another test to evaluate your heart’s function
echocardiogram, an imaging test that helps your doctor assess your heart
ultrasound, an imaging test to help diagnose DVT and abdominal mass (ascites)
abdominal CT, an imaging test that helps your doctor check for an abdominal mass

How is peripheral edema treated?

There are general things you can do to help reduce mild peripheral edema. You can also try these alongside specific treatment for the medical condition causing your edema.

Ways to reduce the swelling
Reduce your salt intake.
Lose weight.
Elevate your feet above the level of your heart while sitting or lying down so that gravity pushes the fluid out of your legs instead of into them.
Take frequent breaks and elevate your legs whenever possible if you’re standing or sitting for a long time.
Wear compression stockings to apply pressure that keeps fluid out of your legs. Shop for nonprescription compression stockings online.
Exercise your calf muscles. Contractions help push blood through your veins so it can’t pool in your leg and move into the soft tissue.

Diuretics

Diuretics (water pills) remove excess fluid from your body. They’re only used when peripheral edema is caused by an underlying condition.

Treatments for specific underlying causes

Treatments may depend on what’s causing peripheral edema. Here are some of the possible treatment options for specific causes of peripheral edema:

venous insufficiency: compression stockings, removing the vein (vein stripping), or surgical repair
congestive heart failure: diuretics or medications that help your heart work more efficiently
kidney disease: medications that increase urine production, dialysis, or a kidney transplant
liver disease: antiviral medication for hepatitis, limiting alcohol, or a liver transplant
malnutrition: a nutritious diet that contains an adequate amount of protein
lymphedema: compression stockings or lymphatic drainage massage
DVT: blood-thinning medication
cellulitis: antibiotics

What is the outlook for people with peripheral edema?

Sock marks themselves aren’t harmful, but very noticeable ones could mean you have peripheral edema.

The outlook of peripheral edema depends on the cause. Temporary edema that’s mild and doesn’t occur with other symptoms shouldn’t be worrisome.

Peripheral edema that’s more severe and persistent may be due to a serious medical condition. The outlook depends on the cause, but it improves with prompt diagnosis and treatment.

The bottom line

Sock marks are caused by pressure from the elastic in them. Peripheral edema can make sock marks more noticeable.

Most often, peripheral edema develops when excess fluid in your body is pulled into your legs by gravity. The edema is usually mild, temporary, and harmless.

However, peripheral edema can be a symptom of an underlying medical condition. If so, the edema is more severe and persistent, and there are usually other symptoms.

If your sock marks are more noticeable, look at your legs. If there’s new or increased swelling or pitting edema, see your doctor right away. You may have a medical condition that requires prompt treatment.

How we reviewed this article:

SourcesHistoryHealthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical journals and associations. We only use quality, credible sources to ensure content accuracy and integrity. You can learn more about how we ensure our content is accurate and current by reading our editorial policy.

Causes and signs of edema. InformedHealth.org (2016).https://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0072593/
Edema. (2018).https://my.clevelandclinic.org/health/diseases/12564-edema
Evans NS, et al. (2016). The swollen leg. DOI:https://doi.org/10.1177%2F1358863X16672576
Stoll BC. (2014). Practical approach to lower extremity edema. http://anmedhealth.org/Portals/16/Services-Images/stoll2014.pdf
Trayes KP, et al. (2013). Edema: Diagnosis and management. https://www.aafp.org/afp/2013/0715/p102.html
What’s causing those swollen feet? (2018).https://www.health.harvard.edu/diseases-and-conditions/whats-causing-those-swollen-feet

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Medically reviewed by Elaine K. Luo, M.D. — Written by The Healthline Editorial Team on September 3, 2019

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Prognosis

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Complications

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Management

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Diet

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Causes & Risk Factors

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Surgery

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What are the symptoms of peripheral edema?

What causes peripheral edema?

Dependent edema

Salt

Hormonal changes

Pregnancy

Heat edema

Obesity

Venous insufficiency

Congestive heart failure

Kidney disease

Liver disease

Malnutrition

Certain medications

What if only one leg has sock marks?

DVT

Cellulitis

Lymphedema

How is peripheral edema diagnosed?

How is peripheral edema treated?

Diuretics

Treatments for specific underlying causes

What is the outlook for people with peripheral edema?

The bottom line

How we reviewed this article:

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