It is not possible to guarantee complete clearance. Treatment should restore an even and uniform appearance to the legs and an improvement of 80-90% can be expected within 3-9 months, depending on the size of the original veins.
Initially the treated legs may look worse for the first month, due to bruising and trapped blood. However, this will disappear over a number of weeks. Veins treated effectively by sclerotherapy, EVLA and/or ambulatory phlebectomy should not return.
However, even with the most skilled therapist, there is a small group of people whose veins do not respond adequately to treatment.
Totally new veins can appear with time. The treatment is therefore directed at the current problem with future treatments likely for some people.