Laser Facial Vein and Leg Spider Vein Therapy- Lasers can be an alternative to sclerotherapy for the treatment of spider veins, superficial purple / red blood vessels most commonly found in clusters on the thighs and legs. A typical treatment takes approximately 30 minutes to an hour depending on the number of areas treated. A single treatment session successfully removes approximately 30-40% of the spider veins treated. In general, one or two additional sessions may be required for optimal results.