Superficial veins that are enlarged and dilated are not working and so act more as storage vessels rather than transport vessels, causing blood to pool within them. Most of our blood is returned to the heart via the deep veins which are much larger veins deep within our muscles. When we eliminate the superficial veins, we force all the blood in the legs to return to the heart via the deep veins which is a more efficient and effective way of doing this. This in fact improves the circulation.