Skin changes on the lower leg: what they mean

Why the skin changes at all

When vein valves fail, blood pools in the lower leg and pressure in the smallest vessels stays high instead of falling when you walk. Held high for years, that pressure gradually pushes fluid, protein and red blood cells out into the surrounding tissue.

The skin around the ankle is where that pressure is greatest, and it responds in a recognisable sequence. Most people notice the changes long before they understand what they are, and often treat them as a skin problem — which is why they so often get creams rather than a scan.

Brown staining

The earliest visible sign is usually a brownish discolouration low on the inside of the leg, above the ankle bone. It can look like an old bruise that never quite cleared.

It is iron. Red blood cells that have leaked out of the vessels break down and leave their pigment behind in the skin. That is why it does not fade the way a bruise does, and why creams make no difference to it.

Staining is not dangerous in itself. What it tells you is that pressure has been high for a long time.

Varicose eczema

Dry, itchy, flaky or weeping skin around the ankle is common at this stage. It is frequently mistaken for ordinary eczema, treated as a skin condition, and improves briefly with steroid cream before returning.

It returns because the cause is underneath. The skin is inflamed because of what is happening in the veins, and treating the surface without addressing the pressure is the same loop that leg ulcers get stuck in.

Scratching matters here more than usual, because broken skin on a leg in this condition is exactly how an ulcer starts.

Hardening of the skin

Later, the skin and the fat beneath it can become thickened and tight — firm to touch, sometimes tender, and noticeably less mobile than skin elsewhere. In advanced cases the lower leg narrows at the ankle while the calf above stays full, giving the leg an inverted bottle shape.

This is the change that most repays catching early, because unlike staining and eczema it does not fully reverse. Treating the underlying vein can stop it progressing; it cannot undo what has already hardened.

Small white scarred patches surrounded by fine red vessels sometimes appear alongside it. These areas are fragile and slow to heal if broken.

Why this sequence matters

Taken individually, none of these looks urgent. Together they are a timeline, and ulceration is what sits at the end of it.

That is the practical reason they are worth acting on. An ulcer takes months to heal, needs compression and dressings, and often recurs. The skin changes that come before it are a warning with plenty of time still on the clock.

What the NICE guideline says

NICE guidance on varicose veins lists skin changes in the lower leg — pigmentation or eczema thought to be caused by long-standing venous problems — as a reason for referral to a vascular service. They sit in the same list as a hard, painful vein with suspected venous incompetence, and as a venous leg ulcer that has not healed within two weeks.

That is worth knowing, because skin changes around the ankle are commonly managed as a dermatological problem for years. The guideline treats them as a venous one, and as grounds for assessment in their own right.

The same guidance sets out what tends to follow. Where a duplex scan confirms varicose veins with reflux in a main trunk vein, endothermal ablation — radiofrequency or laser — is the treatment offered first. Where that is unsuitable, ultrasound-guided foam sclerotherapy comes next, and surgery after that. Compression on its own is the option where none of those is suitable.

What can be done

A duplex ultrasound shows which veins are refluxing. Where a failing vein is found, treating it with radiofrequency ablation or foam sclerotherapy lowers the pressure that is damaging the skin.

Staining may fade partially or not at all. Eczema usually settles considerably. Hardened skin tends to stay as it is, but stops advancing. Most importantly, the risk of going on to ulcerate falls.

If you have brown staining, recurring eczema or tight skin around an ankle and have never had the veins scanned, that is the gap worth closing — whatever is or is not visible on the surface. We are happy to look at skin changes that have been treated as a skin problem and have kept coming back.