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Venous leg ulcer

Also called Leg ulcer, Varicose ulcer, or Stasis ulcer

A venous leg ulcer is a long-lasting sore that usually develops on the inside of the leg, just above the ankle. It is caused by high pressure in the leg veins, when the valves in them do not work well, so the skin breaks down after a minor injury and is slow to heal. It is more common in older people and in people with varicose veins, a past deep vein thrombosis or reduced mobility.

Last updated Nov 9, 2026

What it is

Most ulcers heal within 3 to 4 months with cleaning, dressings and compression bandages or stockings, often looked after by a nurse.

Ulcers can come back, so wearing compression stockings, staying active and raising the legs help prevent this.

Common signs

  • An open sore on the lower leg that does not heal
  • Swelling of the ankles
  • Discoloured or hardened skin around the sore
  • Aching or heavy legs
  • Itching, or a smelly discharge if infected

How it is usually diagnosed

  • Examination
  • Ankle brachial pressure index (ABPI) test
  • Sometimes a vein scan

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Wound care notes
  • ABPI results
  • Vein scan reports
  • Vascular or dermatology letters

Questions to ask your doctor

  • How long will it take to heal?
  • Is compression safe for me?
  • How can I stop it coming back?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Increasing pain, redness or swelling around the ulcer, or a high temperature: get urgent help the same day

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources

Related conditions

Varicose veinsSwollen, twisted veins, usually in the legs. They are common, often harmless, and can be treated if they cause problems.Varicose eczemaItchy, red or discoloured skin on the lower legs, caused by poor blood flow in the leg veins. It is long-term but can be controlled.Deep vein thrombosisA blood clot in a deep vein, usually in the leg. It needs prompt treatment because the clot can travel to the lungs.