Sclerotherapy is a spider vein (thread vein) treatment where each vein or cluster is injected with a solution through a very fine needle. The solution damages the vein at the site it is injected. The spider veins will gradually disappear over a period of a couple of months. Usually 3 or more treatments are necessary, as not all veins will respond to 1 treatment.

A compression stocking needs to be worn for 1 week following sclerotherapy.

If the spider veins are caused by larger, varicose veins, then the varicose veins needs to be treated before the spider veins can be addressed.