Polyposis is a Chinese medical term for a chronic ulcer that occurs in the lower part of the calf, which is mostly secondary to infectious diseases such as varicose veins and dengue in the lower and middle 1/3 junction of the calf, and the wounds are prone to persist for a long time, or although they have closed, they can easily recur due to local injury. Treatment principles: first, eliminate the cause of the disease. Varicose veins of the lower extremities should be actively treated surgically. If it is induced by infectious diseases such as dengue, it should be actively treated with anti-infection. Secondly, high nutrition diet, bed rest, elevate the affected limb, reduce walking to facilitate venous reflux, reduce edema and promote early healing of the ulcer. Third, local wet compresses to control infection. Pay attention to the protection of the affected limb to avoid breakage, such as scratches, bruises, mosquito bites, etc. Fourth, surgical treatment. The ulcer and scar tissue are completely removed, and the wound is repaired with skin pieces or flaps. After the ulcer is healed, high ligation of the saphenous vein and stripping of the varicose vein can be performed to achieve the effect of radical treatment.