Sclerotherapy eliminates spider veins through injection. Over decades, vein doctors have refined this method into a standard treatment for the purple, thread-like veins that appear on the legs and sometimes the face. Today, it is commonly performed in vein treatment clinics without surgery or lasers—just a small needle and a carefully selected solution.

So how can a simple injection make visible veins gradually disappear?

How Spider Vein Treatment Works

A special solution is injected directly into the vein. This type of spider vein treatment, one of the most effective vein therapies, intentionally irritates the vessel walls, causing them to swell and stick together until they seal shut. Imagine pressing both sides of a drinking straw together until they collapse and close, that is similar to what happens inside the vein.

Once the vein is closed, blood immediately stops flowing through it and is naturally redirected through nearby healthy veins. This is not a problem, as the body has many alternative pathways for circulation.

The immune system then recognizes the treated vein as damaged tissue. Over the following weeks, white blood cells gradually break it down. This slow, natural process allows the body to absorb the vein until it fades and eventually becomes no longer visible.

What Can You Expect at Vein Clinics Near You?

You lie down while the doctor cleans your skin with an antiseptic solution. A very fine needle is then inserted, much smaller than most people expect. Since spider veins are close to the surface, only a shallow injection is needed to reach the target.

The injection itself only takes a few seconds. You may feel a brief burning or cramping sensation as the solution spreads through the vein, although some patients feel little to nothing during the procedure and are surprised by how quick it is. This approach, along with laser vein removal, is among the most effective non-surgical options for treating visible veins.

Most sessions involve multiple injections because:

  • Several veins are treated in one visit
  • Larger veins may require more than one entry point
  • Both legs are often treated during the same appointment

Your Body Takes Over After Treatment

The real process begins after you leave the clinic. Your body’s natural healing system responds to the treated vein tissue. White blood cells gradually break down the vein walls, while the lymphatic system removes the cellular debris over time.

At the same time, circulation adjusts immediately. Blood that once flowed through the treated vein is redirected through nearby healthy vessels without interruption. The vein then begins to fade gradually, becoming less visible over the following weeks.

Most treated veins disappear completely within two to six months, although some may take longer or require additional sessions for optimal results.

Why Multiple Sessions Are Needed

Spider veins often appear in clusters. Treating one area can sometimes make nearby veins more visible as blood flow patterns adjust. Larger veins may also require stronger solutions or multiple injections to close completely.

In addition, not all veins respond the same way. Some collapse after a single session, while others need additional treatment. Most patients require two to five sessions spaced a few weeks apart. These intervals allow the body to clear treated veins before addressing remaining ones, helping achieve more complete results.

Permanence: A Question for Your Vein Specialist

Treated veins do not regenerate. Once a collapsed vein is absorbed by the body, that specific vessel is permanently gone and will not reopen.

However, new spider veins can still develop over time, and the underlying factors that contribute to vein disease may continue to affect circulation. Sclerotherapy removes existing veins but does not prevent new ones from forming. Genetics, hormones, weight changes, and prolonged standing can all influence vascular health even after treatment.

Some patients may need occasional maintenance sessions every few years as new veins appear, while others may not develop additional spider veins after their initial treatment course.

The Reality

Sclerotherapy sclerotherapy works by chemically sealing the vein shut, allowing the body to gradually absorb it. It is an established medical treatment that has been refined over decades and is considered a gold standard for spider veins due to its reliability.

For most patients, it delivers consistent results in eliminating visible veins through a minimally invasive procedure that takes only a few minutes and requires little to no downtime or recovery.

Don’t let varicose veins slow you down, book today.