Varicose veins in the lower extremities are a common clinical condition. It affects both aesthetics and may lead to serious complications such as venous thrombosis. Surgical treatment is considered to be the most thorough and effective treatment, but traditional high ligation and stripping are more traumatic and scarring, which affects postoperative recovery and aesthetics. Sclerotherapy uses local injection, which is non-invasive and does not leave scars and other characteristics its has a long history of development. In the middle of the last century, the emergence of liquid sclerotherapy for varicose veins has not been widely accepted due to recurrence and other problems. The advent of foam sclerotherapy has led to a revival of sclerotherapy for varicose veins. This method uses the Tessari tee method to make a foamy mixture of sclerosing agent (1% ethoxylated sclerosing alcohol) and air 1:4, which is injected directly into the varicose veins and the main trunk of the saphenous vein to maximize the evacuation of blood from the target vein by the action of the air bubbles, while reducing the flushing of the sclerosing agent by the blood flow and more fully exerting the effect of the sclerosing agent on the endothelial tissue of the vein. The varicose vein endothelium is immediately dehydrated and necrosed by the action of the sclerosing agent, and the vein undergoes spasm, forming a thrombus and eventually becoming mechanized and occluded. This method is easy to perform, does not require anesthesia, no surgical incisions, and can be done on an outpatient basis. It does not affect work and life after surgery. No scars are left. It is an almost non-invasive method of cosmetic surgery for varicose veins in the lower extremities. Also, this sclerotherapy method is suitable for the sclerotherapy of various body surface hemangiomas and cysts.