In this obliteration technique liquid sclerosant or sclerosant mixed with air (foamed) is injected into the spider veins or the branch varicosities with a very fine needle. This causes an inflammatory closure of the varicose vein in the following days; it shrivels up because the blood flow is interrupted and finally becomes invisible. The treatment is practically painless though it often takes several sessions to achieve perfect results. Compression stockings are recommended for a few days after the treatment.