Spider veins happen when a vein becomes swollen, twisted, or enlarged. Typically, they form on the legs (leg veins) but can appear anywhere on the body, including the face. While both men and women can get them, they are more common in women due to the higher levels of the hormone progesterone. Several factors that may contribute to vein disease, including: Pregnancy Age Birth control Obesity Heredity Prolonged standing Hormonal changes History of blood clots If you have developed spider veins or varicose veins, you may want to consult a vein specialist at the Metropolitan Vein & Aesthetic Center in New York to discuss what treatment options are best for your situation.