Venous leg ulcers are typically caused by venous insufficiency, which means the venous valves in the legs have been damaged and are not functioning normally. The venous valves are designed to help push blood and lymph around the body in a constantly circulating flow. Dysfunctional venous valves mean that a significant portion of
fluid remains in the lower limbs, which results in oedema – a visible swelling caused by a build-up of fluid.