How Sclerotherapy Treats Spider Veins

Sclerotherapy is the gold standard treatment for spider veins and small varicose veins, with a track record stretching back to the 1930s. The procedure involves injecting a specialized solution directly into the affected veins, causing them to collapse, seal shut, and gradually fade from view as your body reroutes blood through healthier vessels. It is quick, effective, and requires no anesthesia or significant downtime. For people bothered by the appearance of visible spider veins on their legs, hands, or even face, sclerotherapy offers a proven, minimally invasive solution that delivers visible improvement within a few weeks. Most people find that two to three sessions produce the degree of clearing they are looking for.

How It Works

During sclerotherapy, your provider injects a sclerosing solution directly into the targeted veins using a very fine needle. The most commonly used agents are sodium tetradecyl sulfate (STS) and polidocanol, both of which irritate the inner lining of the vein wall. This controlled irritation causes the vein to swell, stick together, and eventually seal shut. For slightly larger veins, a foam version of the sclerosing solution may be used, as foam displaces blood within the vein and provides greater contact with the vessel walls.

Once a vein is sealed, blood can no longer flow through it. Your body naturally reroutes circulation through surrounding healthy veins, and the treated vein is gradually reabsorbed by the body over the following weeks. The treated vein fades from visibility as it breaks down and is cleared away.

Each session typically addresses multiple veins. Your provider systematically injects the most visible and problematic veins first, then reassesses at follow-up appointments to determine whether additional veins need treatment. Most people require two to three sessions spaced three to four weeks apart for comprehensive clearing, though the number varies based on the extent of the spider veins.

What It May Help With

• Appearance of spider veins on the legs: fading the small, web-like clusters of red, blue, or purple veins that are visible through the skin
• Appearance of reticular veins: treating the slightly larger, bluish feeder veins that often supply spider vein clusters
• Appearance of spider veins on the hands: addressing visible veins that become more prominent as skin thins with age
• Appearance of facial spider veins: in some cases, very fine facial veins can be treated with sclerotherapy, though laser options like Vbeam are often preferred for the face
• Appearance of vein-related skin discoloration: reducing the blotchy, mottled look that clusters of spider veins can create

Good Candidates

Sclerotherapy works well for people who have spider veins or small reticular veins that bother them cosmetically. It is most commonly performed on the legs, where spider veins tend to cluster on the thighs, calves, and behind the knees. The treatment is effective across all skin types and tones.

Good candidates are generally in good health and have realistic expectations about the gradual nature of results. People who are pregnant or nursing should postpone treatment. Those with a history of deep vein thrombosis (DVT) or blood clotting disorders should discuss their situation thoroughly with their provider before proceeding. People who cannot wear compression stockings or who have significant venous insufficiency may need to be evaluated with an ultrasound before cosmetic sclerotherapy to ensure the underlying venous system is functioning properly.

Pros and Considerations

Benefits:

• Decades of clinical use with a well-established safety and efficacy profile
• No anesthesia, incisions, or stitches required
• Sessions are quick, typically 15 to 30 minutes per treatment
• You can return to normal activities the same day
• Treated veins are permanently eliminated and do not come back

Things to weigh:

• Compression stockings must be worn for one to two weeks after treatment, which can be inconvenient
• Treated veins may initially look worse (darker or more visible) before they fade
• Bruising and temporary skin discoloration at injection sites are common
• New spider veins can develop over time, requiring maintenance treatments
• Rarely, a small amount of trapped blood (matting) or brown discoloration can persist for several months

What a Session Looks Like

1. Assessment: Your provider examines the veins to be treated, often using a bright light or magnification to map the network of spider veins and identify any feeder veins. They may take photographs for documentation and planning.

2. Preparation: The treatment area is cleaned with an antiseptic solution. No numbing is required for most patients, as the needle used is extremely fine (30 to 32 gauge) and the injections cause only a brief, mild stinging sensation.

3. Injections: Your provider inserts the fine needle into each targeted vein and injects a small amount of the sclerosing solution. You may feel a slight burning or cramping sensation that lasts a few seconds with each injection. Multiple veins are treated during a single session, with the provider working systematically across the treatment area.

4. Compression: Immediately after the injections, your provider applies compression pads or bandages over the treated areas and has you put on compression stockings. You are advised to walk for 15 to 20 minutes after the procedure and to wear compression stockings for the recommended period, typically one to two weeks.

Recovery and Results

Recovery from sclerotherapy is straightforward. Most people return to their normal daily routine immediately, including work and light activities. Walking is encouraged, as it promotes healthy blood flow and helps the healing process. The main restriction is avoiding strenuous exercise, hot baths, saunas, and direct sun exposure for one to two weeks.

In the days following treatment, the injected veins may look darker or more prominent, which can be disconcerting but is completely normal. You may also notice bruising, small hard lumps along the treated veins (trapped blood that can be drained at a follow-up visit), and mild tenderness. These effects resolve over the following two to four weeks.

Visible fading begins at three to four weeks and continues to improve over the next two to three months. Spider veins typically fade by 60 to 80 percent after a single session, with additional sessions bringing further improvement. The treated veins do not return, though new spider veins can develop over time due to genetics, hormones, or lifestyle factors. Most people schedule a follow-up assessment four to six weeks after their last session to evaluate results and determine whether additional treatment is needed.

Questions to Ask Your Provider

• What sclerosing solution do you use, and do you offer foam sclerotherapy? Understanding the products and techniques available helps you know what to expect.
• How many sessions do you estimate for my spider veins? An in-person assessment gives the most accurate prediction of the treatment plan.
• Do I need an ultrasound evaluation before starting treatment? This is important for ruling out underlying venous insufficiency, especially if you have larger varicose veins.
• How long will I need to wear compression stockings? Knowing the timeline helps you plan around social and professional obligations.
• Would laser treatment be a better option for any of my veins? For very fine veins or facial spider veins, laser treatments like Vbeam may be more appropriate.
• What is your approach if I develop post-treatment discoloration? Knowing how temporary side effects are managed gives you confidence in the aftercare plan.

Frequently Asked Questions

Does sclerotherapy hurt?

Most people describe a brief stinging or burning sensation with each injection that lasts just a few seconds. The needle is extremely fine (30 to 32 gauge), making the injections much more comfortable than most people expect. No anesthesia is needed for standard spider vein treatment.

How long until my spider veins fade?

Spider veins begin to fade noticeably at three to four weeks after treatment. Full results develop over two to three months. Treated veins often look temporarily darker immediately after the procedure before fading. Multiple sessions may be needed for comprehensive clearing.

Do spider veins come back after sclerotherapy?

Treated veins are permanently eliminated. However, sclerotherapy does not prevent new spider veins from developing over time. Genetics, hormonal changes, and lifestyle factors can all contribute to new vein formation. Many people return for periodic maintenance treatments to address new veins as they appear.

How long do I need to wear compression stockings?

Most providers recommend wearing compression stockings for one to two weeks after each session. The compression helps the treated veins stay collapsed and promotes optimal healing. Your provider will specify the compression grade and wearing schedule for your particular treatment plan.

Can sclerotherapy treat varicose veins?

Sclerotherapy can treat small to moderate varicose veins, often using foam sclerotherapy for better results with larger vessels. Very large or deep varicose veins may require alternative treatments like endovenous laser ablation or radiofrequency ablation. A thorough vein assessment helps determine the most appropriate approach.

Are there any activity restrictions?

Walking is encouraged immediately after treatment. Most providers recommend avoiding intense exercise, heavy lifting, hot baths, and sun exposure on the treated area for one to two weeks. Normal daily activities including work are fine from day one.

Is sclerotherapy safe for darker skin tones?

Yes. Sclerotherapy is safe and effective across all skin tones. However, people with darker skin may have a slightly higher risk of temporary hyperpigmentation at the injection sites. This usually resolves on its own over several months. Discuss any concerns about discoloration with your provider beforehand.