Sclerotherapy
Sclerotherapy is a medical procedure used to eliminate varicose veins and spider veins. Sclerotherapy involves an injection of a solution (generally a salt solution) directly into the vein. The solution irritates the lining of the blood vessel, causing it to collapse and stick together and the blood to clot, and forcing blood to reroute through healthier veins. Over time, the vessel turns into scar tissue, the collapsed vein is reabsorbed into local tissue and eventually fades.