Can varicose and spider veins return even after treatment?

Yes, they can however varicose veins are very unlikely to occur if they are treated correctly in the first place and there is a suitable time for ongoing surveillance (1 – 2 years). Spider veins will almost always return to some extent for the same reason that they occurred in the first place – genetics! The interval between treatments is determined by many factors including the severity of the condition, age of the patient and number of pregnancies etc. but as a guide, a forty-year-old woman should expect to get 5-7 years from Sclerotherapy (if done properly with reticular veins also treated) before she feels the need for further treatment.