Sclerotherapy Millions of women are bothered by unsightly spider veins – those small clusters of purplish, red or blue veins that commonly occur on the thighs or legs. Sclerotherapy involves injecting these spider veins with a tiny microneedle. This is a common cosmetic procedure that requires experience, skill and knowledge of the vascular system. A consultation at Kauffman Medi Spa is required to determine if you are a candidate for this procedure. Multiple sessions may be required.