Varicose veins do not disappear after sclerotherapy, only the lumen of the vein is occluded. Varicose veins can be treated by injecting a sclerosing agent such as polyguinol, polydocanol, etc. into the varicose vein. The sclerosing agent stimulates the vein wall, which causes an inflammatory response within the varicose vein. After the sclerosing agent is injected, the varicose veins are then treated by applying localized compression with gauze rolls and wearing compression stockings to cause occlusion of the varicose veins. Therefore, the varicose veins do not disappear, they are just occluded. The use of sclerotherapy for varicose veins may involve the risk of sclerosant leakage causing tissue inflammation, necrosis or entry into the deep veins complicating thrombosis, etc. After sclerotherapy patients should pay attention to whether there are any manifestations of redness, swelling, heat and pain in the skin of the lower limbs, and should seek medical attention immediately after discomfort occurs and be treated in a timely manner.