Microsclerotherapy Treatment for Thread Veins (Spider Veins)

posted in: Varicose Veins

Thread veins or spider veins, represent a network of small, superficial veins that frequently appear on the legs, face, and occasionally on other body regions. These veins, characterised by their red or blue hue, are conspicuously located near the epidermal layer, yet they generally do not pose significant health risks. Although their presence is benign, their prominence can be a cosmetic concern for individuals, potentially impacting psychological well-being due to perceived aesthetic implications.

Among the array of medical interventions designed to address spider veins, micro sclerotherapy has been recognised as a leading treatment modality in the UK’s medical community. Its preference stems from its non-invasive nature, efficient outcomes, and streamlined procedural methodology.

Microsclerotherapy Treatment for Thread Veins (Spider Veins)  - Vein Solutions


Thread Veins (Spider Veins)

Thread veins, commonly known as spider veins, are small, superficial blood vessels that manifest predominantly in the legs but can also appear on the face and other body areas. Typically measuring 0.5 to 1 millimetre diameter, these veins can present as red, blue, or purple linear patterns or branching networks. Unlike more prominent varicose veins, which tend to bulge, spider veins remain flat under the skin’s surface.

The emergence of spider veins can be attributed to genetic, environmental, and lifestyle factors. Key contributors include:

  • Genetics: A family history of spider veins can predispose an individual to develop them.
  • Hormonal Changes: Fluctuations during puberty, pregnancy, menopause, or as a result of hormone-related medications can increase the risk.
  • Occupational Factors: Professions that require prolonged standing or sitting, like nursing or office jobs, can exert pressure on the leg veins.
  • Obesity: Carrying excess weight can strain the venous system.
  • Trauma: Injuries or surgeries can sometimes lead to the development of spider veins at the site of trauma.
  • Sun Exposure: Overexposure to UV rays can cause spider veins, especially on the face.

While spider veins are clinically benign, they can have profound psychological and emotional implications for patients. Their visibility, especially on exposed areas like the face or legs, can lead to:

  • Cosmetic Concerns: Affected individuals may feel self-conscious about their appearance, leading to a reluctance to wear certain clothing types, especially during warmer seasons.
  • Reduced Self-esteem: Persistent awareness of their presence can negatively impact an individual’s self-worth and confidence.
  • Social Withdrawal: Due to aesthetic concerns, some might avoid social interactions or events where the veins might be noticeable.



Microsclerotherapy is a minimally invasive medical procedure specifically designed to treat spider veins. The technique involves injecting a sclerosing solution into the affected veins using an ultra-fine needle. This solution instigates an inflammatory response within the vein lining, leading the vessel to contract and eventually close off. Over time, the treated veins fade away, being reabsorbed by the body’s natural processes.

The concept of sclerotherapy dates back to the early 20th century, with the first recorded uses targeting more prominent varicose veins. With the evolution of the technique and the refinement of sclerosing agents, the procedure was miniaturised, leading to the birth of microsclerotherapy, tailored specifically for smaller spider veins.

The UK witnessed the adoption of this procedure in the latter half of the 20th century. With advancements in technology and a better understanding of venous anatomy, microsclerotherapy grew in popularity. British medical professionals embraced the procedure, recognising its efficacy and its minimal side effects compared to other methods. Over the years, the technique has been honed and refined, solidifying its place as a preferred treatment modality for spider veins in the UK.

Comparison with Other Treatments for Thread Veins:

Laser Therapy: This non-invasive treatment uses intense light beams to target and destroy the affected veins. While it’s particularly effective for facial spider veins, it may require multiple sessions and can sometimes lead to skin discolouration or burns.

Radiofrequency Ablation (RFA): Though primarily used for more prominent varicose veins, RFA can occasionally be applied to larger spider veins. It involves using radiofrequency energy to heat and seal off the veins. This procedure can be invasive and often reserved for more substantial venous issues.

Endovenous Laser Ablation (EVLA): Similar to RFA, EVLA is mainly used for varicose veins but can sometimes be applied to more prominent spider veins. It employs laser energy, delivered via a thin catheter, to close off the problematic veins.

When juxtaposed with these treatments, microsclerotherapy stands out for spider veins due to its targeted approach, minimal invasiveness, and the absence of thermal energy (as in lasers or radiofrequency). It balances effectiveness and safety, particularly for those who might not be suitable for heat-based procedures.


Basis of Microsclerotherapy

At the heart of microsclerotherapy is the sclerosing solution, a specially formulated agent designed to irritate the endothelial lining of the veins. The solution causes a controlled chemical injury when introduced into the spider veins. This action prompts the veins to shrink and, over time, be naturally reabsorbed by the body. Different sclerosing agents are available, and the choice often depends on the size of the veins being treated and the practitioner’s preference.

The body’s innate response to the sclerosing agent is to initiate an inflammatory process. The endothelial cells lining the vein wall become irritated, leading to the release of inflammatory mediators. These mediators cause the venous wall to contract and swell. Over time, this inflammation prompts the vessel walls to stick together, a process termed fibrosis. As the inflammation subsides, a scar-like tissue replaces the vein, causing the vein to close off. Once closed, the body naturally reabsorbs the remnants, leading to the gradual fading and disappearance of the treated spider vein.

Suitability Criteria for Patients:

For an optimal outcome and reduced risk of complications, it’s essential to determine patient suitability for microsclerotherapy. Factors that influence eligibility include:

Vein Size and Location: Microsclerotherapy is most suited for small spider veins, typically those less than 1 millimetre in diameter. The procedure can be performed on various body parts, but the legs are the most common treatment site.

Medical History: Patients with a history of severe allergic reactions, especially to sclerosing agents, might not be suitable. A comprehensive assessment of a patient’s medical background is crucial.

Previous Vein Treatments: Those who have undergone other vein treatments, such as surgery or laser therapy, might still be eligible. However, the treating physician needs to be aware of these treatments.

Pregnancy and Breastfeeding: Microsclerotherapy is generally not recommended for pregnant or breastfeeding women.

Mobility Issues: Good mobility can enhance post-procedure recovery, as movement aids in the prevention of potential complications like deep vein thrombosis.

Skin Health: Active skin infections or certain skin conditions at the treatment site may temporarily contraindicate the procedure until resolved.


Microsclerotherapy Procedure

A detailed consultation with the patient is the first step, where the practitioner assesses the severity and extent of the spider veins, discusses the patient’s medical history, and sets realistic expectations for the outcomes.

The treatment area is carefully examined for signs of skin infection, inflammation, or other conditions that might contraindicate the procedure.

Sometimes, practitioners might use vein lights or Doppler ultrasound to map the veins, ensuring accurate targeting during the procedure.

Once deemed suitable, patients are provided with an informed consent form detailing the procedure’s risks, benefits, and alternatives.

The treatment area is cleaned and sterilised using an antiseptic solution. Patients are positioned comfortably, and all necessary equipment, including the sclerosing solution, syringes, and ultra-fine needles, is readied.

The Process:

The practitioner chooses a starting point, typically working on the most prominent veins first.

Utilising an ultra-fine needle, the practitioner introduces a small amount of the sclerosing solution directly into the spider vein. Depending on the size and location, multiple injections might be needed.

The vein might blanch or fade upon injection, indicating the solution’s effect. A slight stinging or burning sensation is not uncommon and usually subsides quickly.

The practitioner then moves to the next section or another vein until all the targeted veins have been treated.

Immediate Post-treatment Care:

After the procedure, compression stockings or bandages are applied to the treated area. These help to maintain vein closure, reduce swelling, and enhance the effectiveness of the treatment.

Patients are usually kept for a short observation period to ensure no immediate adverse reactions.

Patients are encouraged to walk around shortly after the procedure to reduce the risk of complications, such as clot formation.

Patients are advised to avoid strenuous activities, direct sun exposure on the treated area, and hot baths for a specified duration. They are also provided guidelines on how long to wear the compression stockings or bandages.

A follow-up appointment is scheduled to assess the treatment’s effectiveness and to address any concerns or complications.


Effectiveness and Results

Microsclerotherapy remains one of the leading treatments for spider veins in the UK, owing mainly to its impressive efficacy. Studies have shown that most patients treated with microsclerotherapy see a noticeable improvement in the appearance of their spider veins.

Research indicates that approximately 80-90% of treated spider veins respond favourably to microsclerotherapy. The success rates can vary depending on the size and location of the veins, the skill of the practitioner, and the specific sclerosing agent used.

Patient satisfaction surveys have consistently shown high levels of satisfaction post-treatment, with many patients reporting an improvement in appearance and a boost in self-confidence and well-being.

Duration for Visible Results:

Immediately post-procedure, there might be redness, slight swelling, or minor bruising at the injection sites. These typically resolve within a few days to a week.

The treated veins will begin to fade within a few weeks, although this can vary among individuals. Some patients might see results as early as 2-3 weeks post-treatment.

Most optimal results are typically visible around 3-6 months after the treatment. During this period, the treated veins undergo fibrosis and are gradually reabsorbed by the body.

Longevity of Treatment Outcome:

Once successfully treated, the specific spider veins do not recur. The outcome is essentially permanent for those particular veins.

It’s crucial to note, however, that microsclerotherapy does not prevent the formation of new spider veins in the future. Genetic predisposition, lifestyle factors, or hormonal changes can still lead to the appearance of new spider veins in treated or adjacent areas.

Depending on individual predisposition, some patients opt for maintenance sessions every few years to address new spider veins, ensuring smooth and clear skin.


Post-Procedural Care and Recommendations

The immediate application of compression via stockings or bandages aids in keeping the treated veins closed, which facilitates their subsequent absorption by the body.

Compression helps control localised swelling and minimises the risk of bruising at the injection sites. Compression reduces the risk of superficial blood clot formation post-procedure by promoting blood flow in the deeper veins.

Depending on the extent of the treatment and the practitioner’s recommendation, patients might be advised to wear compression stockings or bandages continuously for 48-72 hours and, after that, during the daytime for 7-10 days. The compression garment’s specific type and pressure grade can vary based on individual needs.

Activity Levels and Exercise Post-Treatment:

Patients are typically encouraged to walk around shortly after the procedure, promoting blood circulation and reducing the risk of complications.

For the initial 24-48 hours, strenuous activities, such as heavy lifting or high-intensity workouts, should be avoided.

Mild to moderate exercises like walking, cycling, or swimming can usually be resumed after 48 hours. Still, it’s always wise to consult the treating practitioner before restarting any rigorous exercise routine.


  • Keeping hydrated supports overall vascular health and aids in recovery.
  • When resting, especially in the first 24 hours, elevating the legs can help reduce swelling.
  • Regular check-ins allow the practitioner to assess healing and the effectiveness of the treatment.


  • Avoid prolonged sitting or standing in one position for too long.
  • Excessive heat can dilate blood vessels, potentially affecting the treatment outcome. It’s advisable to avoid hot environments for at least 1-2 weeks post-procedure.
  • Treated areas can be more sensitive to the sun, raising the risk of skin discolouration. Using sunscreen or covering up can mitigate this risk.


Potential Risks and Side Effects

Many patients notice a transient erythema (redness) around the injection sites post-procedure. This is a typical and expected response, indicating that the sclerosing agent is taking effect.

Mild swelling can occur, especially if more prominent or many veins are treated. This usually subsides within a few days.

A mild burning or itching sensation might be experienced during and immediately after the injections. This is temporary and often dissipates within a few hours.

Less Common Side Effects:

Though rare, some patients might exhibit allergic reactions to the sclerosing agent or other substances used during the procedure. Symptoms could range from itching and hives to more severe systemic responses.

In some instances, iron deposits from the blood can cause a brownish discolouration in the treated area. This is typically temporary, but in rare cases, it can persist for several months or longer.

The sclerosing solution rarely can cause small ulcers or blisters at the injection site. These can be painful and might take a few weeks to heal, occasionally leaving a small scar.

Risk of Deep Vein Thrombosis (DVT):

Deep Vein Thrombosis involves the formation of a blood clot in one of the deep veins, typically in the legs.

The risk of DVT post-microsclerotherapy is exceedingly low. The treatment targets superficial veins and uses a sclerosing solution in tiny quantities. However, no procedure is entirely without risk; thus, the association, albeit minuscule, exists.

Symptoms to watch out for include pain, swelling, tenderness, discolouration or redness in the affected limb, and warmth. Prompt medical attention is vital if any of these symptoms are noticed.

Addressing Concerns:

If common side effects such as redness, swelling, or discomfort persist beyond the typical duration, it’s advisable to consult the treating practitioner.

Any symptoms like difficulty breathing, chest tightness, facial swelling, or systemic rashes should be treated as emergencies.

While some discomfort is expected, if pain intensifies or swelling doesn’t subside, these could indicate complications, warranting medical attention.

While microsclerotherapy is generally considered a safe and effective treatment for spider veins, patients should be well-informed of potential risks and side effects. Patients can navigate the recovery period with assurance and confidence by maintaining an open dialogue with their healthcare provider and being vigilant post-procedure.


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