Varicose veins in the lower extremities are mainly caused by damage to the valves of the veins in the lower extremities, which are mainly characterized by the protrusion of the blood vessels from the skin surface, like earthworms, curved and lumpy. Therefore, it is commonly called “earthworm legs”. In the early stage of varicose veins of lower extremities, there are no symptoms, so it is easy to be ignored and not taken seriously. Generally, after more than 10 years of disease, as the backflow of venous blood and bruising increase, it will gradually cause lower extremity edema, darkening of calf skin (pigmentation), bruising dermatitis, painful venous thrombosis, and even ulcers. In addition to the prolonged standing factor, varicose veins have a relationship with prolonged sitting and estrogen.