A compression garment and a roll of bandage laid out ready for a fitting at Renu

Why is clear fluid leaking from my swollen leg?

Clear or straw-coloured fluid weeping from swollen skin is lymphorrhoea: lymph escaping through stretched or broken skin. It needs a doctor or nurse today.

By The Renu lymphatic and massage team · 7 min read

Clear or straw-coloured fluid weeping from a swollen leg is almost always lymph escaping through skin that has been stretched, scratched or damaged. Cancer Research UK calls it lymphorrhoea, or 'wet legs'. It is a see-someone-today sign, not because the fluid itself is dangerous but because open, wet skin on a swollen limb is an easy entry for bacteria, and the pressure behind it will keep damaging tissue until the swelling is controlled. A doctor or nurse manages the skin first; the compression and lymphatic care that stop it coming back follow.

What the fluid is

The liquid is lymph. Cancer Research UK describes lymphorrhoea as lymph fluid leaking from the surface of the skin, clear or straw coloured, able to happen anywhere but most common in the legs, which is why some people call it “wet legs”. The NHS lists fluid leaking through the skin among the symptoms of lymphoedema, and Macmillan notes that it tends to happen when lymphoedema is severe.

Lymph is the fluid that normally sits between your cells, is collected by the lymph vessels and returned to the bloodstream. In a swollen leg that return has failed, so the fluid has nowhere to go but into the skin itself. Stretch any membrane far enough and it will weep. The National Cancer Institute makes the same observation from the other direction: skin in swollen areas is stretched thin, which is why bacteria get in so easily.

If you are reading this with a damp sock, the first thing to know is that the fluid itself is not poison, infection or a sign that something has burst. The second thing is that it needs a clinician today, for reasons we explain below.

Why it starts

Cancer Research UK lists the triggers, and most people recognise at least one:

A scratch to the skin while it is swollen
Hurting the area when the skin has become scaly
The area swelling quickly
Low levels of a protein called albumin in the blood
Not moving, or being unable to move
A change in general health, such as cellulitis
Not wearing compression garments or bandages that have been recommended

The common thread is pressure meeting a weak point. Swelling that rises fast, a limb that has stopped moving so the muscle pump no longer helps lymph along, or a few days without a garment all raise the pressure under the skin. A scratch, a cracked patch of dry skin or an insect bite then gives it an exit.

Why it is a see-someone-today sign

Three reasons, all from the sources rather than from caution for its own sake.

Infection. The NHS says the build-up of fluid in lymphoedema makes you more vulnerable to infection, and that cellulitis, a bacterial infection of the deep layer of the skin, is its most common complication. The NCI calls cellulitis a potentially life-threatening infection. Wet, broken skin on a fluid-rich limb is the open door. The Cleveland Clinic lists infected wounds that can spread and cause sepsis, bone infection or heart-valve infection among the complications of untreated swelling.

Tissue damage. Cancer Research UK says it is important to have treatment for lymphorrhoea to help prevent long-term tissue damage, and the Cleveland Clinic lists wounds that heal slowly or not at all among the complications of swelling that is left untreated.

The cause may have changed. Lymphorrhoea can follow a sudden increase in swelling or a bout of cellulitis, and either of those needs a doctor to assess what has shifted.

That is why Macmillan asks you to see a lymphoedema specialist, GP or district nurse as soon as possible, and Cancer Research UK says to contact your doctor or nurse straight away, or go to the emergency department, if you have fluid leaking from your skin with redness, heat or pain.

How to tell it apart from an infection

Lymphorrhoea on its own is clear or straw coloured and the skin around it, while stretched, is not hot. The signs that an infection has started are the ones Cancer Research UK lists for cellulitis:

Lymphorrhoea alone	Lymphorrhoea with infection
Clear or straw-coloured fluid	Fluid plus reddening of the skin that starts in one area and spreads, or red lines; on brown or black skin the area may look darker, yellow or purple
Skin stretched and shiny but not hot	Warmth or heat around the area
No fever	Temperature of 37.5°C or higher, or below 36°C
Feeling otherwise well	Flu-like symptoms, feeling generally unwell, vomiting, dizziness

Anything in the right-hand column means the emergency department or an urgent call rather than a routine appointment. The NHS oedema page says the same from the other side: swelling that is red or hot to the touch, or a very high temperature, calls for urgent care. Our page on how to know if lymphedema is infected goes through the signs in more detail.

What a clinic like ours can and cannot do

We cannot treat weeping skin, and we will not try. Open skin needs dressings, which are a nurse’s or doctor’s work, and manual lymphatic drainage is paused wherever infection is possible. If you arrive with a leaking leg, we will ask you to see a doctor or nurse that day and we will not work on the limb.

What we can do comes afterward. Cancer Research UK lists the treatment for lymphorrhoea as dressings, skin care, bandaging, physical activity and compression wraps, and Macmillan describes specialists stopping the skin from leaking with bandages or compression garments. Once the skin is dressed and settled, the swelling behind it is the problem, and that is where complete decongestive therapy belongs: manual lymphatic drainage to move fluid toward working pathways, compression to stop it returning, movement and skin care. Meeghan Mackenzie, our Certified Lymphedema Therapist and Certified Compression Fitter, delivers it, and a compression fitting is a 30-minute appointment ($25).

Compression is the part that does the most to prevent a repeat. A randomised trial in Australian adults with chronic leg oedema and recurrent cellulitis, followed up for 18 months and published in 2026, found cellulitis recurred in 20 percent of those given compression garments against 47 percent of those given education alone, and hospital admission for cellulitis fell by a similar margin. Controlling the swelling protects the skin. The Learning Centre’s compression garments page explains how garments are chosen and worn.

Keeping the skin intact afterward

Once the leg has settled, the daily work is skin protection. From Cancer Research UK’s list: protect your hands and legs from cuts and scratches during household jobs, wash and dry your feet thoroughly including between the toes, wear insect repellent, use sunscreen of at least SPF 30, prefer an electric razor to blades, wear well-fitting shoes and avoid going barefoot, cut nails carefully, and check your skin daily for thickening, colour changes, blisters or spots. NYU Langone adds moisturising the limb at least once a day with a low-pH lotion to soothe dry, cracked skin, applying antiseptic to small cuts, and avoiding hot baths, saunas and steam rooms because heat promotes swelling.

Keep wearing the compression you have been prescribed. Cancer Research UK names not wearing recommended garments as one of the causes of lymphorrhoea, and the trial above is the evidence for why it matters. If skin on the limb is becoming thick, hard or scaly, why lymphedema skin gets thick and hard explains what is happening.

When to go to emergency

Go to the emergency department, or call for urgent help, if fluid is leaking and the skin is also red, hot or painful, if your temperature is 37.5°C or higher or below 36°C, if you feel shivery, flu-like, sick or faint, or if the leaking leg has swollen suddenly or severely. The NHS asks you to call emergency services for swelling with shortness of breath, chest tightness or pain, coughing up blood or palpitations, because those can mean a clot in the lungs.

For leaking without those signs, see your GP, lymphoedema specialist or district nurse today. Bring your compression garments with you. And once the skin has been seen, contact us and we will plan the lymphatic and compression care that keeps it from happening again. The Learning Centre’s when to seek medical care page lists every red flag for swelling in one place.

Questions people ask

How quickly does leaking skin need to be seen?

Today. Macmillan asks you to see a lymphoedema specialist, GP or district nurse as soon as possible if you have lymphorrhoea. Cancer Research UK goes further: contact your doctor or nurse straight away, or go to the emergency department, if fluid is leaking and the skin is also red, hot or painful, because that combination suggests infection.

Why did it start when I have been sitting in a chair most of the day?

Not moving is one of the causes Cancer Research UK lists for lymphorrhoea, alongside a scratch to swollen skin, injury to scaly skin, an area swelling quickly, low blood albumin, cellulitis, and not wearing recommended compression. Still legs mean the muscle pump that moves lymph is switched off, so fluid gathers under the skin until the pressure finds a way out.

Should I keep my compression on while the skin is leaking?

Ask the nurse or specialist who sees you, because the answer depends on what the skin looks like. Compression is part of the treatment for lymphorrhoea, through bandaging and wraps over dressings, but it is applied by someone who can protect the broken skin. Cancer Research UK says that even during cellulitis garments are usually only removed if they cause pain.

Will lymphatic drainage stop the leaking?

Not on its own, and not until the skin has been seen. Manual lymphatic drainage is paused during any active infection, and weeping skin is treated as at risk of infection until a clinician says otherwise. Once dressings and compression have settled the skin, lymphatic drainage and compression together address the swelling behind it, which is what keeps it from happening again.

Does lymphorrhoea cause lasting damage?

It can if it is left. Cancer Research UK says treatment is important to help prevent long-term tissue damage, and the Cleveland Clinic lists wounds that heal slowly or not at all, and infected wounds that can spread, among the complications of untreated swelling. Treated promptly, the skin usually settles once the pressure behind it is controlled.