Dystrophic changes in the skin of the lower extremities are one of the symptoms of primary lower extremity deep venous valve closure insufficiency, which mostly occurs in people who are persistently engaged in physical labor or standing workers, and has a higher incidence in farmers, hairdressers, athletes, surgeons and other people. Based on the clinical manifestations of varicose veins in the lower extremities, the diagnosis is not difficult. The details are as follows. Simple varicose veins of the lower extremities are more common with saphenous varicose veins, and small saphenous varicose veins alone are less common; they are more common in the left lower extremity, but they can develop successively in both lower extremities. The main clinical manifestations are dilatation, elongation and tortuosity of the superficial veins of the lower limbs. If the disease continues to progress, mild swelling of the ankle and trophic changes in the skin of the foot and boot area, including skin atrophy, desquamation, pruritus, hyperpigmentation, skin and subcutaneous tissue sclerosis, eczema and ulcer formation, may occur when the valves of the communication veins are disrupted.