Foam Sclerotherapy for Varicose Veins

Sclerotherapy, also known as foam sclerotherapy for varicose veins, is a non-surgical varicose vein treatment method aimed at closing fine and medium-diameter diseased veins over time by administering a sclerosant medication in liquid or foam form inside the vein. Sclerotherapy does not require anaesthesia in most cases and is performed as an outpatient procedure. In people with reflux in the main leg veins, it can be planned alongside or before minimally invasive endovenous treatment.

What is foam sclerotherapy for varicose veins?

Sclerotherapy is based on the principle of controlled irritation of the inner lining of the vein by an injected agent, causing the vein walls to stick together and close. The closed vein stops carrying blood, turns into connective tissue over time, and loses its visibility as it is absorbed by the body. This process progresses over several weeks; its speed and outcome may vary depending on the diameter of the vein.

The goal and expected outcome of the procedure are not the same for everyone. Telangiectasias (commonly known as spider veins), reticular veins described by their greenish appearance, and thicker varicose clusters require different approaches; varicose vein symptoms such as leg heaviness, burning sensations, or evening swelling help clarify the extent of the condition. The concentration of the medication is also selected according to the vein diameter; sclerosant medications prepared in different concentrations are used for this purpose.

Sclerotherapy may not be suitable as a standalone treatment for every vein type. Which method is applied to which vein is decided by evaluating examination findings and colour Doppler ultrasound results together. If there is a significant underlying source of reflux beneath the visible surface veins, the treatment plan is established based on the entire venous system, not just the visible veins.

What is the difference between liquid and foam forms?

Liquid sclerotherapy is primarily preferred for fine spider and reticular veins, whereas the foam form may be chosen for larger varicose veins in suitable cases. The main distinction between the two applications is how the agent behaves inside the vein.

Foam is obtained by mixing liquid medication with air or gas using a specialised technique. The resulting foam displaces blood inside the vein, extending the contact time of the medication with the vein wall; therefore, larger veins can be targeted with a similar amount of medication. In larger veins and targets close to the main vein, ultrasound guidance may be considered during the procedure.

• Liquid application usually takes 15–30 minutes; 1–3 sessions may be required for most individuals.
• Foam application usually takes 20–40 minutes; 1–2 sessions may be considered for most individuals.
• Anaesthesia is not required in most cases for either method, and returning to daily activities on the same day is often possible.

These ranges vary according to the number of veins to be treated, their diameter, and the overall treatment plan. Heat-based endovenous laser and radiofrequency treatments are different endovenous procedures that operate via a catheter inserted into the vein; they are evaluated more frequently when significant reflux is detected in the main trunk vein. Rather than claiming superiority of one method over another, the focus is on which procedure is appropriate for which specific vein.

Microsclerotherapy for spider veins

For spider veins, microsclerotherapy performed with ultra-fine needles and low-concentration medication may be considered in suitable patients. The target is telangiectasias, commonly known as spider veins or capillary varicosities; these are frequently accompanied by reticular veins described as fine greenish vessels.

Needles finer than insulin needles are used during the procedure. Ultra-fine veins can be illuminated or magnified using a special light source or loupes. Because the medication is administered at the lowest concentration and in tiny amounts across multiple entry points, the session may take longer; however, the discomfort felt remains minimal for most people.

Spider veins are not regarded solely as a cosmetic issue. In some individuals, they can be the initial sign of an underlying venous insufficiency; therefore, a Doppler evaluation is conducted prior to planning. For veins too fine for needle entry, transcutaneous laser may be considered as a complementary option, with the final method clarified during consultation. Compression stockings and venotonic medications may relieve symptoms, but they are not expected to directly eliminate existing veins.

How is non-surgical varicose vein treatment planned?

In non-surgical varicose vein treatment, sclerotherapy can be planned alone or in combination with other endovenous methods depending on vein diameter, source of reflux, and Doppler findings. The initial step in planning is evaluating the entire venous blood flow of the leg, not just the visible surface veins.

Colour Doppler ultrasound is the primary diagnostic investigation at this stage. The examination displays flow in superficial, deep, and main trunk veins, helping reveal points of valvular incompetence and sources of reflux. The mapped findings determine which vein will be occluded and which technique will take precedence.

If significant reflux is identified in the main trunk vein, laser, radiofrequency, or another suitable endovenous method may be addressed prior to or within the same treatment plan. Closing only the surface veins without eliminating the source of reflux increases the likelihood of visible veins refilling over time. Heat-based procedures typically utilise local anaesthesia, usually lasting 30–60 minutes, with a return to daily routine often possible within 1–2 days; these durations vary based on the method and individual patient condition.

The physician makes decisions based on the location of the targeted veins, the patient’s medical history, current medications, and treatment expectations.

Who may be a suitable candidate for sclerotherapy?

Sclerotherapy is mostly considered for individuals with spider veins, reticular veins, and selected medium-sized varicose veins in the legs. Suitability is not determined solely by the external appearance of the veins; Doppler findings, overall health status, and underlying comorbid conditions are evaluated together.

The procedure is generally postponed during pregnancy and breastfeeding. In the presence of active deep vein thrombosis, infection at the treatment site, known allergy to the sclerosant agent, or severe arterial disease, candidate suitability must be re-evaluated. Conditions requiring prolonged immobility and a cardiac defect known as patent foramen ovale may necessitate an individualised risk assessment, particularly prior to foam sclerotherapy.

The procedure is possible in most cases for individuals taking blood thinners. These medications should not be discontinued on the patient’s own initiative; dosage adjustments and timing are managed in consultation with the treating physician. Which method will be applied to which vein and whether the procedure is suitable for the patient can only be determined following physical examination and imaging.

How long does foam treatment take, and how many sessions are needed?

A sclerotherapy session typically takes 15–30 minutes depending on the number of veins and the technique used; with foam application, this duration may extend to 20–40 minutes in most cases. These timeframes are not a fixed guarantee and vary according to the extent of the treated area.

During the procedure, the patient lies on the examination table, target veins are identified, and if necessary, highlighted using magnification or a specialised light source. A very fine needle is inserted into the vein, and the agent is slowly injected. Most people experience a brief pinprick similar to a mosquito bite at needle entry, followed by a mild burning sensation lasting a few seconds during injection; the level of sensation varies depending on the anatomical area and the individual.

Upon completion of the procedure, the leg is wrapped with an elastic bandage or fitted with a compression stocking. Anaesthesia is not required in most cases. You may be asked to walk for 15–20 minutes under observation so that rare immediate reactions can be spotted; many patients return to daily routine on the same day. Post-procedure recommendations regarding mobility, travel, and work schedules are tailored individually.

Because the amount of medication that can be safely administered in a single session is limited, extensive areas may be divided into sections. A waiting period of 4–6 weeks is generally observed between sessions, and 1–3 sessions may suffice for most individuals; the number may increase in extensive spider vein networks.

What should you pay attention to during recovery?

Walking after sclerotherapy is generally an integral part of the recovery plan, and most people can return to daily activities on the same day. The calf muscles engaged while walking act like a pump pushing venous blood upward; this motion supports circulation and contributes to reducing clot risk. Walking at least 30 minutes a day during the initial days may be recommended, with duration dictated by the physician’s plan.

Compression stockings or bandages are typically used for 1–2 weeks. For liquid sclerotherapy, this period may drop to a few days, whereas for foam sclerotherapy, it may be longer; the physician decides on the compression class and duration of use. Key precautions after foam treatment include avoiding saunas, hot baths, sunbathing, and strenuous exercise during the first 1–2 weeks. Sitting motionless for extended periods and long flights may not be advisable during the first week.

Bruising, tenderness, and mild swelling at the procedure site subside within 1–2 weeks for most people. A brownish mark may remain over the closed vein; this discolouration fades over several months in most individuals. Sun protection and adherence to recommended compression stocking wear help during this period.

Possible side effects and risks

The most common side effects following sclerotherapy are transient findings such as redness, bruising, mild swelling, and tenderness at the injection site. These usually subside quickly and do not require additional treatment.

Brownish discolouration along the closed vein, known as hyperpigmentation, may occur; this mark mostly fades within 6–12 months, although the likelihood of permanence varies by individual. In a condition called telangiectatic matting, very fine new spider veins become prominent around the treated area; it often resolves spontaneously, though additional sessions may be required for some patients.

Less frequent side effects include allergic reactions to the medication, small skin ulcers at the injection site, transient blurred vision or headaches lasting a few minutes after foam injection, and deep vein thrombosis. If increasing leg pain or significant swelling develops after the procedure, a physician should be consulted without delay; if sudden shortness of breath, chest pain, or sudden visual or speech impairment occurs, emergency medical services should be called immediately.

Taking a detailed medical history, ultrasound planning via Doppler, and adhering to dosage limits help mitigate these risks; nevertheless, no medical procedure is entirely risk-free.

Are sclerotherapy results permanent?

Veins closed with sclerotherapy do not reopen in most cases; however, because varicose veins represent a chronic predisposition, new visible veins may develop in other vessels over the years. Therefore, the outcome is the product of managing the entire venous system over time, rather than a single procedure.

The initial visible change becomes noticeable in 4–6 weeks for most individuals. Fading of pigmentation marks and appearance of the final result may extend up to 6 months, and in some individuals up to a year. Two main factors influencing the outcome are whether the source of reflux is accurately identified and managed where necessary before the procedure, and regular follow-up afterwards.

An annual check-up can help with the early assessment of newly formed small veins; the follow-up interval depends on how the person’s vein disease progresses. If signs that varicose veins are progressing appear, such as increasing leg swelling, darkening of the skin or thinning of the skin, the assessment may need to be brought forward.

Suitability and the choice of method are determined in Istanbul at Acıbadem Kozyatağı Hospital, through an examination and colour Doppler ultrasound assessment by Dr Arzu Ercan.

Frequently Asked Questions

Is sclerotherapy painful?

Most people feel a brief sting as the needle goes in and a mild burning sensation while the medication is injected. How uncomfortable it feels depends on where the veins are, the technique used and the person’s own pain perception; in most cases no anaesthesia is needed.

Can sclerotherapy treat spider veins?

Microsclerotherapy can be used to treat fine spider veins in suitable patients. Because there may be an underlying vein insufficiency, a clinical assessment and, where needed, a Doppler scan are carried out before treatment is planned.

What is the difference between liquid and foam sclerotherapy?

The liquid form may be preferred for finer veins, while the foam form can be considered for larger veins because the medication stays in contact with the vein wall for longer. The technique is chosen according to the vein diameter and Doppler findings.

How long does sclerotherapy take?

A session usually takes 15–30 minutes; with foam treatment it can extend to 20–40 minutes in most cases. The number of veins and the size of the treatment area can change the duration.

When can I go back to work after the procedure?

Most people can return to desk work the same day, and walking is usually recommended after the procedure. The timing for heavy physical work, intense exercise and hot environments depends on the technique used and your doctor’s advice.

Does sclerotherapy leave marks on the skin?

A brownish discolouration may appear along the treated vein and, in most people, fades over time, often within 6–12 months. Whether it lasts depends on factors such as vein diameter, skin characteristics and aftercare.

Sources

• Sclerotherapy: procedure, recovery and results — Cleveland Clinic
• Sclerotherapy for varicose veins — NHS