What is Foam Sclerotherapy? Deep Leg Vein Treatment Guide

How Foam Fixes the Root Cause of Thread Veins

If you’ve been researching how to get rid of prominent blue veins or stubborn clusters of surface thread veins, you have likely come across the term foam sclerotherapy.

But what actually is it, how does it differ from traditional liquid injections, and what does the process look like in action?

In this guide, we break down exactly how foam sclerotherapy works, why it is a game-changer for long-lasting leg vein clearance, and feature two short demonstration clips from our London clinic so you can see exactly what to expect.

The Core Difference: Liquid vs. Foam

Traditional microsclerotherapy uses a liquid solution injected directly into tiny, surface-level red capillary lines. While highly effective for small webs, liquid can be less effective on larger, deeper veins.

Foam sclerotherapy solves this problem completely.

The medical sclerosant solution used in foam sclerotherapy is a rich, shaving-cream-like consistency, thanks to a small amount of air or gas.

When injected, this thick foam doesn’t mix with your blood. Instead, it actively pushes the blood out of the way, coating the internal walls of the target vein cleanly. This causes the vessel walls to safely collapse, seal shut, and eventually be naturally reabsorbed by your body over the following weeks.

Video Demonstations

The following videos show how foam sclerotherapy quickly interrupts the blood flow so that veins ‘disappear’ before the eyes.

Why Treating the “Feeder Veins” is Critical for Success

Many high-street beauty clinics only treat the visible surface thread veins using standard lasers or basic liquid injections. While this might work for smaller spider veins and even provide a temporary fix for larger veins, there is a risk that deep veins could pop right back up within a few short months because the underlying feeder vein (reticular vein) was left open.

Think of it like a tree: if you only trim the tiny twigs at the top but leave the main branch pumping sap up from below, new twigs will grow back immediately.

Foam sclerotherapy allows us to target those deeper blue feeder branches. By shutting down the high-pressure source, the surface thread veins clear up much faster and stay gone for good.

Understandably, many patients feel a little anxious about the idea of ‘bigger’ injections; but there’s no need to worry, because the needles we use are still incredibly fine, so the discomfort is remarkably minimal.

What to Expect After Your Treatment

Foam sclerotherapy is a walk-in, walk-out procedure that requires absolutely zero downtime. A typical session takes just 20 to 30 minutes.

• Immediate Walk: You will be able to walk straightaway and this is advisable to optimise deep circulation.
• Driving & Daily Life: You can drive yourself home from the clinic and return to normal, light daily activities straight away.
• The Healing Phase: The treated veins may look slightly darker or bruised at first. This is a completely normal sign that the treatment is working. Over the next few weeks, your body’s natural healing systems will break down the closed vessels, revealing clearer, smoother skin.

Ready to See Which Treatment is Right for Your Legs?

Every leg is entirely unique. During your initial assessment, we use specialised lights to see exactly what is happening beneath the surface. Depending on requirements, we can even combine liquid microsclerotherapy and foam sclerotherapy for optimal results.

To get started without leaving the house, you can submit photos of your legs directly through our secure portal for a quick, expert opinion.

• Explore our full Sclerotherapy Treatment Guide to read more.
• Ready to book? Get in touch with our London team today.

London Vein Treatment Centre

Established in 2003, Cosmedics Skin Clinics offers spider vein and thread vein removal treatment at a choice of London Vein Treatment Centres as well as one in Bristol, using medically proven techniques.

All thread vein treatments are carried out by skilled and experienced doctors or surgeons.

For more information, please complete the form to the right hand side or call 020 7386 0464.