A venous ulcer is a slow-healing wound that commonly develops on the lower legs due to poor circulation caused by vein disease. Common varicose ulcer causes include chronic venous insufficiency, damaged vein valves, untreated varicose veins, and prolonged blood pooling in the legs. Symptoms may include swelling, skin discoloration, leg heaviness, pain, and open sores near the ankles. At USA Vein Clinics, vein specialists provide advanced diagnostic evaluations and minimally invasive treatments to improve circulation and support healing.