Sclerotherapy is a medical procedure that treats varicose and spider veins. The procedure involves injecting a solution directly into a vein, causing the treated vein to seal shut and disappear from view over time. The treated blood vessel (vein) is then naturally resorbed by the body. This procedure will be performed by your board-certified dermatologist and treatments should be done about once a month. Generally 3-6 treatments are needed for best results, and some patients may need more treatments.