Sclerotherapy results are permanent for the specific veins that are successfully treated. Once a vein collapses and is absorbed by the body, it doesn’t come back. The catch is that new veins can develop over time, which is why many people eventually return for additional sessions. A single session eliminates an estimated 50% to 80% of the injected veins, and most people need two to four sessions to reach optimal clearance.
When You’ll See Results
The timeline depends on the size of the veins being treated. Spider veins and small varicose veins typically fade within 3 to 6 weeks. Larger varicose veins take longer, usually 3 to 4 months before they fully disappear. The treated veins often look worse before they look better, appearing darker or more prominent in the first week or two as the body breaks them down.
How Many Sessions You’ll Need
About 20% to 40% of patients see significant improvement after just one session. But most people need two to four treatment sessions to achieve over 80% elimination of their targeted veins. Foam sclerotherapy tends to work faster than liquid sclerotherapy. In one study comparing the two approaches, foam achieved an 88% success rate after the first session compared to 69% for liquid, though the final outcomes were similar once patients completed their full treatment course. The foam version also required fewer sessions on average (1.1 versus 1.4).
Recurrence and New Vein Formation
The veins that sclerotherapy successfully destroys are gone for good. But venous disease is progressive, meaning the underlying conditions that caused those veins, such as weakened valves and increased pressure in the venous system, can produce new problem veins in different locations. This is the main reason people associate sclerotherapy with veins “coming back.”
Long-term data puts this in perspective. A study tracking patients with varicose veins from a specific type of venous insufficiency found that only about 51% of sclerotherapy patients remained recurrence-free at four years. By comparison, surgical stripping had an 81% recurrence-free rate at the same time point. Being female was also identified as a factor that increased recurrence risk. These numbers reflect new vein development rather than failure of the original treatment.
Even with more advanced vein closure procedures, recurrence is common. A two-year follow-up study found that 35% to 44% of patients treated with different closure methods showed some symptoms of recurrence, and progression of vein problems was observed in both the treated leg and the opposite leg. This suggests that recurrence is largely driven by the disease itself rather than any particular treatment method.
Compression Stockings and Aftercare
What you do after treatment affects how well it works. Wearing compression stockings keeps pressure on the treated veins, helping them stay collapsed while the body absorbs them. Most providers recommend at least one week of firm compression. A clinical trial found that adding three more weeks of lighter compression after that initial week significantly reduced post-treatment bruising and skin discoloration. Following your provider’s compression instructions closely gives each session its best chance of success.
Maintaining Results Long-Term
Think of sclerotherapy less as a one-time fix and more as ongoing management of a chronic tendency. The treated veins are permanently gone, but your body can always form new ones. Many people schedule maintenance sessions every one to three years to address new spider or varicose veins as they appear. Staying active, maintaining a healthy weight, wearing compression stockings during long periods of standing, and elevating your legs when resting can all slow the development of new problem veins. The goal isn’t necessarily to prevent every new vein from forming, but to stay ahead of them so they never reach the point your original ones did.