Sclerotherapy for Spider Veins: How It Works and What to Expect

Sclerotherapy for Spider Veins: How It Works and What to Expect

Those fine red and blue lines that fan across the thighs, calves, and ankles have a name: spider veins. They’re incredibly common, usually harmless, and one of the most reliably treatable cosmetic concerns we see. The gold-standard fix is a quick in-office injection called sclerotherapy.¹ Here’s the plain-language guide to how it works, what a session feels like, and how it compares to laser, backed by the research.

Spider veins, known medically as telangiectasias, are tiny blood vessels that have widened and become visible just beneath the skin. They’re very common on the legs, affecting roughly 40% of women.³ Larger blue-green “feeder” vessels sitting deeper are called reticular veins, and they often fuel the spider veins above them. They’re usually cosmetic rather than medical, but because they can occasionally signal underlying vein issues, they’re worth having properly evaluated.

Sclerotherapy injects a small amount of a medication called a sclerosant directly into the vein. It deliberately irritates the inner lining (the endothelium), triggering controlled inflammation and a process called endofibrosis — the walls stick together and seal shut.¹ Blood reroutes through healthier vessels, and over the following weeks your body breaks down and reabsorbs the treated vein until it fades. Controlled trials confirm it works better than placebo, though no single sclerosing agent has proven clearly best.²

A session is quick and done right in the office, with no anesthesia. Using a very fine needle, larger reticular feeder veins are injected first, then the smaller spider veins, in the same visit or a later one.⁴ You’ll feel small pinches and sometimes a brief sting or cramp as the solution goes in. Most people are in and out in 15 to 45 minutes and can drive home and resume normal activity the same day.

There’s very little downtime. Wearing class 2 compression stockings for up to about three weeks helps the treated veins stay closed and improves results, and walking is encouraged.⁴ Some bruising, mild swelling, or temporary lumpiness over the treated lines is normal at first. The veins fade over the following weeks rather than instantly, so patience between sessions is part of the process.

This is the most common question we get. For leg spider veins, sclerotherapy is generally first choice. A prospective randomized study comparing it against Nd:YAG laser on opposite legs found the two performed equally well, with most patients rating clearance good to excellent after three sessions.³ Reviews note that laser ablation of leg telangiectases tends to have limited efficacy compared with well-performed sclerotherapy, which remains the most effective approach for these vessels.⁴ Laser still has a role for vessels too small to cannulate or for needle-phobic patients, but for typical leg spider veins the injection usually wins.

Most people need more than one. Spider veins are treated in stages, with appointments commonly spaced two to eight weeks apart so each area settles before the next pass.⁴ Many patients see meaningful clearance within about three sessions, though the exact number depends on how extensive the veins are.³ Because new spider veins can form over time, occasional maintenance is normal.

Sclerotherapy has a long track record and is considered very safe when performed correctly.¹ ⁴ The most common cosmetic side effect is temporary brownish discoloration along the treated line (hyperpigmentation), which a systematic review found is usually self-limited and fades over months.⁵ Bruising, mild matting (a blush of tiny new vessels), and temporary lumpiness can also occur. Rarely, some people notice a brief visual disturbance like a migraine aura shortly after treatment; a systematic review confirms this is uncommon and self-resolving.⁶ Serious complications are rare in experienced hands.

Most healthy adults bothered by leg spider veins are good candidates, but the right first step is an evaluation. Because spider veins can be fed by larger underlying veins, a proper history and clinical exam (sometimes with ultrasound) maps the full extent of the venous picture before any injection.⁴ This matters: treating the surface without addressing a deeper source leads to short-lived results. At Lumini, sclerotherapy is physician-performed, and we start with a consultation to confirm it’s right for your veins and goals.

We offer physician-performed sclerotherapy for spider and reticular veins of the legs. Pricing is personalized at your consultation, because the number of sessions depends entirely on how extensive your veins are. Our team treats patients in English, Spanish, and Portuguese, and we serve Aventura, Sunny Isles, Bal Harbour, and North Miami Beach.

Does sclerotherapy actually get rid of spider veins? Yes. The sclerosant seals the vein shut, and your body reabsorbs it over the following weeks so it fades.¹ It’s considered the gold-standard treatment for leg spider and reticular veins.¹ ⁴

Is sclerotherapy or laser better for leg veins? For most leg spider veins, sclerotherapy is first-line. A randomized comparison found sclerotherapy and Nd:YAG laser worked about equally well, and reviews note laser is generally less effective than good sclerotherapy for leg telangiectases.³ ⁴

How many treatments will I need? Usually more than one. Sessions are typically spaced two to eight weeks apart, and many people see strong clearance within about three sessions, depending on how extensive the veins are.³ ⁴

Does it hurt and is there downtime? You’ll feel small pinches and brief stinging, but there’s no anesthesia and little downtime. Compression stockings are worn for up to about three weeks afterward, and you can walk and resume normal activity the same day.⁴

What are the side effects? The most common is temporary brown discoloration along the treated line, which usually fades over months.⁵ Bruising and mild matting can occur, and a brief migraine-like visual disturbance is a rare, self-resolving side effect.⁶

1. Beneat A, Oropallo A. Sclerotherapy. StatPearls [Internet]. 2024. PMID: 38261698. https://pubmed.ncbi.nlm.nih.gov/38261698/
2. Schwartz L, Maxwell H. Sclerotherapy for lower limb telangiectasias. Cochrane Database Syst Rev. 2011. PMID: 22161437. https://pubmed.ncbi.nlm.nih.gov/22161437/
3. Munia MA, et al. Comparison of laser versus sclerotherapy in the treatment of lower extremity telangiectases: a prospective study. Dermatol Surg. 2012. PMID: 22221551. https://pubmed.ncbi.nlm.nih.gov/22221551/
4. Smith PC. Management of reticular veins and telangiectases. Phlebology. 2015. PMID: 26556703. https://pubmed.ncbi.nlm.nih.gov/26556703/
5. Bossart S, et al. Skin hyperpigmentation after sclerotherapy with polidocanol: A systematic review. J Eur Acad Dermatol Venereol. 2023. PMID: 36196455. https://pubmed.ncbi.nlm.nih.gov/36196455/
6. Willenberg T, et al. Visual disturbance following sclerotherapy for varicose veins, reticular veins and telangiectasias: a systematic literature review. Phlebology. 2013. PMID: 23761921. https://pubmed.ncbi.nlm.nih.gov/23761921/

Medically reviewed by Dr. Thiago Queiroz, D.O., Medical Director, Lumini Medical Spa. Educational, not a substitute for an in-person consultation.