Sclerotherapy is a simple and effective treatment for smaller varicose veins and spider veins. It’s a non- invasive procedure that involves injecting a solution directly into the vein, causing it to seal closed and become scar tissue. Blood flow is naturally rerouted through healthier veins, with more efffective circulation. The scar tissue from the collapsed vein is eventually absorbed into the body. Typically, veins treated with sclerotherapy fade within a few weeks, although it may take up to a month to see full results. More than one sclerotherapy treatment may be needed.