Lasers can treat spider veins and small varicose veins. Laser light can destroy the vein without damaging your skin. Small spider veins may disappear immediately after treatment. Large spider veins and varicose veins will darken, and you’ll see them for a few months before they disappear. To get complete clearing, you may need 3 or more treatments. There is no downtime and patients can return to work and many of their normal activities the next day. This treatment is not limited to your legs.