The common causes can be subdivided into the following categories: 1, simple capillary dilation: not involving the deep veins and the corresponding saphenous veins; 2, saphenous varicose veins: such as simple calf varicose veins after saphenous varicose vein surgery; 3, deep and superficial venous valve insufficiency: causing a backflow of blood from the deep veins to the superficial veins, thus causing subcutaneous varicose and dilated veins. Most of the clinical treatment methods are minimally invasive or even non-invasive, such as injection of new foam sclerosing agent for effective treatment, which can be achieved with treatment and does not cause incisions and does not require hospitalization. The process of injecting new foam sclerotherapy is similar to an infusion, where the drug is injected into the patient’s blood vessels to create a vascular occlusion, and the patient can walk normally and go home after treatment.