Sclerotherapy is a common treatment used for small- to medium-sized  veins and is easily performed in our office with minimal to no discomfort.    A tiny needle is used to inject a solution (sclerosant) into the vein that  irritates the lining. In time, the veins collapse and are reabsorbed by the  body. This results in the surface veins being no longer visible. Depending  on the size and location of the veins, different types and strengths of  sclerosants are used. Many times, only one sclerotherapy session is  required for completion of treatment but it could take two to three  sessions for full resolution.   Normal activities can be resumed immediately after sclerotherapy, though  support hose and/or bandages may be required for several days following the procedure.  Sometimes bruising and pigmentation may occur after sclerotherapy, but almost all of this  fades away within a few months. The best way to treat pain or soreness after the procedure is  with over-the-counter medicines like ibuprofen.