A solution is injected through a very fine needle directly into your vein. At this point, you may have mild discomfort or cramping for 1 to 2 minutes, especially when larger veins are injected.
Sclerotherapy is done in the doctor's office by a dermatologist or a surgeon, and the procedure itself takes about 15 to 45 minutes. The number of veins injected in one session depends on their size and location, as well as your general medical condition.