1.What are the prerequisites for the treatment of superficial varicose veins of lower limbs? The deep veins of the lower extremities are open, able to walk, without serious diseases of heart, brain and lungs. 2.What cases of superficial varicose veins of lower limbs can be treated by sclerotherapy alone? What cases need minimally invasive surgical treatment? Superficial varicose veins of the lower extremities with grade C1 and C2 and fine diameter can be treated with simple sclerotherapy. Minimally invasive surgery is required for superficial varicose veins of the lower extremities with grade C3 to C6 and thicker veins, and for those with thicker veins in the thighs. 3.What are the advantages of minimally invasive surgery? Minimally invasive surgery is less traumatic than traditional surgery, with faster recovery, less pain, aesthetics, and thorough treatment, and can reach the tiny vessels that cannot be reached by traditional surgery, with short hospitalization time and low recurrence rate. 4.How to deal with the painful pigmentation of hard knots after minimally invasive surgery for superficial varicose veins of lower limbs? The painful pigmentation of hard knots after minimally invasive surgery of superficial varicose veins of lower limbs is a natural phenomenon, which can subside naturally with oral diosmin or medical elastic stockings and fast walking for one hour every day for about three months or more. These phenomena show that the treatment is successful and the chance of recurrence is less, otherwise the varicose veins are raised and soft, which means that the treatment needs to be strengthened once more. 5.Can superficial varicose veins with ulcers in lower limbs be cured? It can be cured, we have a large number of such cases, some patients have ulcers for more than 20 years and deep to the periosteum, but they are cured even under our careful treatment. 6.Can superficial varicose veins and itchy eczema of lower limbs be treated? Yes, most of these patients see dermatology first and then refer to vascular surgery for treatment. After treatment of varicose veins, itching and eczema are obviously relieved, and then combined with dermatology treatment, the patient can be cured.