The Medical Clinic NYC offers top-notch safe service with sclerotherapy. Our physician treats veins that are twisted and enlarged, known as varicose veins. Varicose veins are usually in the legs. Sclerotherapy also treats spider veins, a mild form of varicose veins. Sclerotherapy usually works best on small varicose veins. Sclerotherapy involves using a needle to put a solution into the vein. The sclerotherapy solution causes the vein to scar. The scarring forces blood through healthier veins. The collapsed vein then fades. After sclerotherapy, treated veins tend to fade within a few weeks, although they might not disappear completely. It can take a month or more for full results. Some veins need more than one sclerotherapy treatment. Sclerotherapy is usually done to make the veins look better. The procedure also can improve symptoms related to varicose veins, including aching, swelling, burning and cramping at night. Sclerotherapy generally has few serious complications. Side effects can occur where the needle goes into the skin include bruising, raised red areas (called hives), small skin sores, darkened skin and a number of tiny red blood vessels. Deep vein thrombosis carries a risk of a blood clot traveling from the leg to the lungs and blocking a vital artery. This is known as a pulmonary embolism. It’s a very rare complication of sclerotherapy that needs immediate medical care. The symptoms include trouble breathing, chest pain or dizziness, or coughing up blood.