C1: capillary dilatation or spider-like venous dilatation; C2: varicose veins of the lower extremities; C3: varicose veins of the lower extremities with swelling of the lower extremities; C4: varicose veins of the lower extremities with altered skin lesions; C5: varicose veins of the lower extremities with healing ulcers; C6: varicose veins of the lower extremities with active ulcers. The indications, efficacy and prognosis of each treatment are related to the clinical classification and the level of doctors’ treatment.