A venous ulcer is a type of sore that develops on the skin, usually around the lower legs and ankles. It occurs when the veins in the legs do not properly return blood to the heart, leading to increased pressure and fluid buildup. This condition is often associated with chronic venous insufficiency and can result in skin damage and open wounds. These ulcers can be painful and may take a long time to heal. Treatment typically involves improving blood flow, managing symptoms, and keeping the ulcer clean. Common methods include using compression bandages and medications to promote healing and prevent infection.