Ankle Skin Darkening and Venous Ulcers: What Varicose Veins Do to the Skin

Why does vein disease change the skin?

Healthy leg veins carry blood upwards against gravity using one-way valves. When those valves leak, a condition called venous reflux, the column of blood falls back down the leg each time you stand, and the pressure inside the small veins near the ankle rises well above normal. That sustained pressure, often called venous hypertension, is what injures the skin. Red blood cells leak out and break down, leaving iron pigment that stains the skin brown. Inflammation follows, the fat and skin beneath become hard and tender, and the tissue's blood supply and ability to repair itself deteriorate. Varicose veins are the visible sign of the same reflux; the skin changes are its consequence. The chronic venous insufficiency page explains the underlying condition in more detail.

What are the stages of skin damage?

Vascular surgeons describe venous disease with the CEAP classification. The clinical stages are a useful way to recognise where you are:

Progression is not inevitable and it is not quick, but the direction of travel is one way unless the pressure is addressed. The common pattern is years of aching and swelling, then a patch of itchy, discoloured skin on the inner ankle, then a small wound after a scratch or knock that stays open for weeks.

Which signs should prompt a scan?

• Brown or rust-coloured staining on the inner ankle or lower calf that does not fade.
• Itching, flaking or weeping eczema over the lower leg that keeps returning despite moisturiser or steroid cream.
• Hard, tight, tender skin above the ankle, sometimes giving the lower leg an inverted-bottle shape.
• White, shiny, scar-like patches near the ankle, which mark areas with a poor blood supply.
• Any wound on the lower leg that has not healed within two weeks, especially on the inner ankle.

Not every brown ankle is venous. Arterial disease, diabetes, heart failure and some skin conditions can look similar or coexist, which is why the assessment includes the arteries as well as the veins. See foot and leg wounds that are slow to heal for the arterial side of the picture.

What does treatment involve?

The first step is a duplex ultrasound to map which veins are refluxing and to confirm that the deep veins and the arteries are healthy. For skin changes and ulcers, international guidelines recommend treating the faulty superficial veins rather than relying on compression alone, because closing the source of the pressure helps ulcers heal and reduces the chance of them returning. The options are the same keyhole methods used for ordinary varicose veins: radiofrequency or laser ablation, medical glue and ultrasound-guided foam sclerotherapy, chosen on the scan findings. Compression, leg elevation, skin care and wound dressings continue alongside, and an open ulcer is managed with a dressing regime until it heals. Where a healed or open ulcer is present, the ESVS guideline advises early intervention on the refluxing veins rather than waiting.

Is this a cosmetic problem?

No. Thread veins and uncomplicated varicose veins can be a cosmetic concern, but discoloured, hardened or ulcerated skin is a medical condition with a recognised stage and a recognised treatment pathway. Treatment at this stage is generally claimable under Integrated Shield plans and corporate schemes, subject to the insurer's assessment; the clinic team can help check your cover before anything is booked. See payment and insurance.

Common questions about skin changes from vein disease

Will the brown staining go away after treatment?

The iron pigment is deposited in the skin and tends to fade only slowly, if at all, even after the reflux is treated. What treatment aims to do is stop the damage progressing, settle the eczema and hardening, and reduce the risk of an ulcer. The colour change is best thought of as a marker of what has already happened rather than something that will reverse quickly.

Can a venous ulcer heal without treating the veins?

Many venous ulcers will heal with good compression and dressings, but they often return because the underlying pressure has not changed. Treating the refluxing veins alongside compression is recommended in current guidelines because it is associated with faster healing and fewer recurrences than compression alone.

Is a swollen, discoloured leg ever an emergency?

A leg that becomes suddenly swollen, hot, red or painful, or a wound that is spreading, foul-smelling or accompanied by fever, needs same-day assessment because the cause may be a clot or an infection rather than slow venous damage. Read about the warning signs of DVT. For sudden or severe symptoms call 995 or go to the nearest emergency department.

I have skin changes but no visible varicose veins. Is it still vein disease?

It can be. The refluxing veins may lie beneath the surface and only show on ultrasound, and some people have skin changes from a previous deep vein thrombosis, called post-thrombotic syndrome. A duplex scan distinguishes these, which is why the scan comes before any decision about treatment.