Want to sit like a lady? Then sit like a lady! Varicose veins (and their smaller sisters, spider veins) are hereditary—and that’s that. If you’re among the estimated 20 to 25 percent of people with the genes for them, your veins will get stretched and stiff and show through your skin, whether you cross you legs or not. If you have them and want to treat them, see a phlebologist (a vein specialist) about an easy laser treatment called ablation.