Sclerotherapy efficiently treats varicose and spider veins. It’s often regarded the treatment of choice for small varicose veins. Sclerotherapy means injecting a solution straight into the vein. The sclerotherapy solution induces the vein to scar, forcing blood to reroute through healthier veins. The collapsed vein is reabsorbed into local tissue and eventually fades. After sclerotherapy, handled veins tend to disappear within a few weeks, although seldom it may take a month or more to see the full results.