Veins were never meant to be seen, much like all the exposed wiring on the back of the moon. Keep up appearances with this Groupon. Choose from Three Options $129 for one sclerotherapy treatment (a $300 value) $239 for two sclerotherapy treatments (a $600 value) $329 for three sclerotherapy treatments (a $900 value) Spider-vein specialists inject as many veins as possible during each 30-minute treatment. The sclerotherapy solution causes the lining of the vein to swell, eventually cutting off blood flow and causing the vein to disappear within two weeks to two months. Most patients average two sessions.