Sclerotherapy for Spider Veins: What the Research Shows
If you've noticed thin, web-like red or bluish lines on your legs — especially after years of standing on your feet, sitting through long shifts, or simply getting a bit older — you've probably already searched "spider vein treatment near me" more than once. Spider veins are extremely common, almost never dangerous, and one of the most frequent cosmetic concerns we see at Blanqa Medspa here in Henderson, NV. The good news: sclerotherapy, the treatment we use for them, has been studied in controlled clinical trials for decades. Below is an honest look at what those studies actually show, how the treatment works, and who tends to get the best results.
What Causes Spider Veins?
Spider veins (and their slightly larger cousins, reticular veins) form when the tiny one-way valves inside a vein weaken. Blood that should keep moving toward the heart instead pools and flows backward, raising pressure inside the vessel and stretching its walls until it becomes visible through the skin. A number of factors make this more likely:
• Genetics: a family history of visible leg veins is one of the strongest predictors.
• Prolonged standing or sitting: jobs or routines that keep you on your feet (or seated) for long stretches increase pressure in the leg veins.
• Hormonal changes: pregnancy, hormonal birth control, and perimenopause/menopause can all weaken vein walls.
• Age: vein valves naturally lose some elasticity and function over time.
• Body weight and prior leg injury: both can add extra pressure or damage to the venous system.
None of these factors are within a patient's full control, which is why spider veins are so common — and why they aren't a sign that you've done anything wrong.
How Sclerotherapy Works
Sclerotherapy is a simple, in-office procedure. A very fine needle is used to inject a sclerosing solution — most commonly polidocanol — directly into the affected vein. The solution irritates the vein's inner lining, causing it to swell and stick together (a process called endofibrosis). Over the following weeks, the closed vein is gradually reabsorbed by the body, and blood is naturally rerouted through healthy veins nearby. No incisions, lasers, or general anesthesia are involved.
What the Research Shows
Sclerotherapy is one of the more thoroughly studied cosmetic vascular treatments, with multiple randomized, blinded trials comparing sclerosing agents against each other and against placebo. Here's what four key sources found:
• The EASI Study (Phlebology): this double-blind, randomized trial followed 316 patients with spider and reticular veins across 19 German medical centers. At three months, polidocanol achieved a 96% treatment success rate with 88% of patients reporting they were “satisfied” or “very satisfied” — compared to 92% success and 64% satisfaction with sodium tetradecyl sulfate, and just 13% satisfaction with saline placebo. Results held steady at the six-month follow-up.
• Bertanha et al., JAMA Dermatology (triple-blind RCT): in 93 women treated for reticular veins, polidocanol diluted in hypertonic glucose eliminated 95.17% of treated vein length, versus 85.40% with glucose solution alone (P<.001) — with no significant difference in minor side effects like pigmentation between the two groups.
• Sclerotherapy — StatPearls (NCBI Bookshelf): this clinical reference describes sclerotherapy as the “gold standard” intervention for superficial spider, reticular, and varicose veins. Its most common side effect is temporary hyperpigmentation at the injection site, reported in roughly 30% of patients, which typically fades over the following months.
• American Academy of Dermatology: the AAD notes that sclerotherapy remains the most common treatment for visible leg veins, that spider veins typically fade within 3 to 6 weeks (larger veins take 3 to 4 months), and that most patients need 2 to 3 sessions for full results — with outcomes depending heavily on the treating provider's skill and technique.
Taken together, the evidence is consistent: sclerotherapy with modern sclerosing agents like polidocanol produces high success rates and strong patient satisfaction, and it clearly outperforms doing nothing (placebo). As with any cosmetic procedure, results vary by individual, vein size, and the number of sessions completed.
Is Sclerotherapy Right for You?
Most people bothered by visible spider or reticular veins on the legs are reasonable candidates, but a proper evaluation matters. Good candidates typically:
• Have visible spider or reticular veins without signs of significant underlying venous insufficiency
• Are bothered by the appearance, or have mild symptoms like aching or heaviness from small surface veins
• Understand that most people need 2 to 3 sessions spaced several weeks apart for full clearance
A few situations call for extra caution or a different plan altogether, and we screen for these at consultation:
• Pregnancy or breastfeeding
• A personal history of blood clots (DVT) or a known clotting disorder
• Active skin infection at or near the treatment site
• A known allergy to the sclerosing agent
• Signs of larger, underlying vein disease, which may need an ultrasound evaluation or vascular referral before cosmetic treatment
What to Expect: A Realistic Timeline
• Day of treatment: a brief in-office visit with no anesthesia required — you can walk out and resume most normal activities the same day.
• First 2–3 weeks: compression stockings and daily walking are typically recommended to support healing and reduce side effects.
• 3–6 weeks: treated spider veins generally fade from view.
• 3–4 months: larger reticular or varicose veins take longer to fully fade.
• Ongoing: sclerotherapy treats the veins it closes, but it doesn't prevent new spider veins from forming elsewhere over time — some patients return for periodic touch-up sessions.
Why Henderson and Las Vegas Patients Ask About This So Often
Between service jobs that keep people on their feet for long shifts, an active outdoor lifestyle, and a climate that means shorts and sandals for much of the year, spider veins are one of the most common cosmetic concerns we hear about at our Henderson, NV office. If you've been self-conscious about visible leg veins, or you're simply curious whether sclerotherapy makes sense for your specific veins, a consultation is the right first step — not a guess based on what you've read online.
As with any cosmetic procedure, individual results vary, and sclerotherapy isn't a substitute for medical evaluation if you have symptoms of a larger vein problem (such as significant swelling, pain, or skin changes). This article is educational and general in nature and is not personalized medical advice. We'd love to see you for a consultation to talk about your specific veins and goals.
About the Author
Bianca Camille Fong, APRN, FNP-BC is a board-certified Family Nurse Practitioner and the Founder & CEO of Blanqa Medspa and Fong Precision Care in Henderson, NV. She founded Blanqa to bring safe, evidence-based aesthetic and wellness care to the Henderson and Las Vegas community, combining clinical training with a genuine, patient-first approach to every treatment.
Blanqa Medspa
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1485 West Warm Springs Road, Suite 109B, Henderson, NV 89014
Phone: 702-997-6764 | Email: hello@blanqaLV.com
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Sources
• Rabe E, et al. “Sclerotherapy of telangiectases and reticular veins: a double-blind, randomized, comparative clinical trial of polidocanol, sodium tetradecyl sulphate and isotonic saline (EASI study).” Phlebology.
• Bertanha M, et al. “Sclerotherapy for Reticular Veins in the Lower Limbs: A Triple-Blind Randomized Clinical Trial.” JAMA Dermatology.
• Sclerotherapy. StatPearls, NCBI Bookshelf (National Library of Medicine).
• American Academy of Dermatology. “Leg veins: Why they appear and how dermatologists treat them.” aad.org.