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 swell and stick together, and the blood to clot. Over time, the vessel turns into scar tissue that fades from view.
 

The treatment area will be sterilized, then the doctor will begin injecting the sclerosant into first the larger veins, then smaller ones, monitoring the progress of the chemical throughout the process. For every inch of vein treated, one injection will likely be administered. Since the injection needle is so small, patients often feel little pain and do not need any anesthesia. The injection process typically is complete in just 15 to 30 minutes. A minor stinging or burning sensation is common during and right after the injections are made, but is short lived. After the treatment is finished, a bandage will be applied and most physicians recommend the use of compression or support hose for at least a few days. The number of veins injected in one session varies, and depends on the size and location of the veins, as well as the general medical condition of the patient.

The number of sessions required depends on the depth, number, and size of the veins being treated. While some patients are happy with the results after just one treatment, others may desire further injections for the optimal effect. These follow up treatments should be spaced at least four weeks apart so that the affects of the previous treatment can be accurately evaluated before injecting more. Patients can determine the amount of treatments they may need and the cost associated with them by discussing their situation with their specialist.

Sclerotherapy is performed in the doctor's office by a dermatologist or a surgeon and requires that you do not partake in any aerobic activity for a few days after the procedure.