Varicose ulcers are sores that form due to chronic venous insufficiency, in which the veins are unable to carry enough blood back to the heart. This is usually due to weakened valves in the veins that allow for the backflow of blood, leading to increased pressure and swelling. Varicose ulcers often form around the ankles and lower legs, and are characterized by red, swollen skin, and can be painful.
In contrast, venous ulcers are sores that form due to poor circulation in the veins. This is usually due to the inability of the veins to carry enough oxygenated blood back to the heart. Venous ulcers commonly form in the lower legs and can be characterized by yellow, scaly skin. They may also be surrounded by a dark rim. Unlike varicose ulcers, venous ulcers typically do not cause pain.
In conclusion, varicose ulcers and venous ulcers are both types of sores caused by poor circulation. Varicose ulcers form due to chronic venous insufficiency and are characterized by red, swollen skin, while venous ulcers form due to poor circulation in the veins and are characterized by yellow, scaly skin. Additionally, varicose ulcers are often painful, whereas venous ulcers typically do not cause pain.