Sclerotherapy for leg veins

Liquid, foam and ultrasound guidance

A sclerosant irritates the target vein wall so that the vein closes and gradually fades. Liquid and foam are not selected identically for every vessel; some veins require ultrasound guidance and assessment of reflux. A few simple injections is an incomplete description: the vein type, underlying cause and health of the venous circulation matter.

Section sources: AAD · Leg vein assessment and treatments · Cambridge University Hospitals · Ultrasound-guided foam sclerotherapy

What should be assessed first?

Discuss previous clots or embolism, allergy, migraine, pregnancy and mobility problems. Report hormonal medicines, anticoagulants and upcoming long travel; prescription changes require clinical coordination. New one-sided swelling or a painful vein needs medical assessment first. Doppler ultrasound may be appropriate, and a phone photograph cannot establish whether the deeper circulation is functioning normally.

Section sources: AAD · Leg vein assessment and treatments · Cambridge University Hospitals · Ultrasound-guided foam sclerotherapy · HealthLink BC · Deep vein thrombosis

Clearance and recurrence

Small and larger veins do not respond on the same timetable, and several sessions may be needed. Early discoloration or firmness is not automatically failure but requires follow-up. Some veins remain, reopen or develop elsewhere. Define the goal as improvement in particular veins or symptoms rather than permanently perfect legs; the procedure may not relieve every leg symptom.

Section sources: Gloucestershire Hospitals NHS · Foam sclerotherapy risks and outcomes · Mayo Clinic · Sclerotherapy

Walking and an individualized compression plan

Walking and movement are commonly part of aftercare. If compression is recommended, fit, pressure and duration should be individualized; one universal duration is not supported by strong evidence. A garment causing foot pain, color change or numbness is not normal: follow the team’s written safety instructions and seek prompt advice. Arterial disease can alter compression suitability.

Section sources: Multisociety clinical guideline · Compression after superficial vein treatment · Cambridge University Hospitals · Ultrasound-guided foam sclerotherapy

Skin care and post-treatment discoloration

Bruising, firm treated veins or brown tracks can persist for weeks to months. Avoid scratching, improvised pressure or exfoliating products on unhealed sites. A simple moisturizer can address dryness on intact skin if the team allows it; it does not immediately erase vascular pigmentation. Ask specifically about washing, shaving, exercise and sun protection during recovery.

Section sources: Mayo Clinic · Sclerotherapy · Gloucestershire Hospitals NHS · Foam sclerotherapy risks and outcomes · AAD · Choosing a moisturizer and avoiding irritation

Clots, arterial injury and emergencies

New pain and swelling in one leg requires urgent assessment for a clot. Breathlessness, chest pain, coughing blood or stroke symptoms require emergency care. Sudden severe pain with a pale, cold or discolored foot can indicate compromised blood supply or an arterial complication and also warrants emergency assessment. Do not dismiss these as normal vein closure.

Section sources: HealthLink BC · Deep vein thrombosis · Clinical review · Injection sclerotherapy and arterial injury · Cambridge University Hospitals · Ultrasound-guided foam sclerotherapy

Comparing options and making the decision

Surface laser may be discussed for selected small vessels; larger-vein reflux may call for an endovenous procedure or surgery. No approach is best for every vein. Ask what causes the symptoms, which veins are being treated, what follow-up is required and how residual veins would be handled. Declining a purely cosmetic intervention remains a reasonable choice.

Section sources: AAD · Leg vein assessment and treatments · Mayo Clinic · Sclerotherapy

Frequently asked questions

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Sources and context

Canadian sources take priority for regulatory context. FDA or other foreign information does not establish Canadian authorization for a product or use. A source-check date is distinct from publication date or independent clinical approval.

1. AAD · Leg vein assessment and treatmentssociety · 2026-10-17
2. Cambridge University Hospitals · Ultrasound-guided foam sclerotherapyhospital · 2026-10-17
3. HealthLink BC · Deep vein thrombosispublic-health · 2026-10-17
4. Gloucestershire Hospitals NHS · Foam sclerotherapy risks and outcomeshospital · 2026-10-17
5. Mayo Clinic · Sclerotherapyhospital · 2026-10-17
6. Multisociety clinical guideline · Compression after superficial vein treatmentguideline · 2026-10-17
7. AAD · Choosing a moisturizer and avoiding irritationsociety · 2026-10-17
8. Clinical review · Injection sclerotherapy and arterial injuryreview · 2026-10-17