Sclerotherapy may require several treatment sessions, depending on your individual needs. It is better to treat the vein in several sessions if your vein problems are extensive to minimize any discomfort. Each session takes about one half-hour and involves a series of injections, according to the size and number of veins. Most patients find the injections minimally uncomfortable – like a pin prick. Bruising is normal and will fade in 2-3 weeks. There is no need for time off work and moderate exercise is encouraged following treatment. Following treatment, compression stocking are applied which are worn continuously and with doctors instructions on proper usage.