Venous ulcers (
venous insufficiency ulceration,
stasis ulcers,
stasis dermatitis,
varicose ulcers, or
ulcus cruris) are
wounds that are thought to occur due to improper functioning of venous
valves, usually of the legs (hence
leg ulcers). They are the major occurrence of
chronic wounds, occurring in 70% to 90% of leg ulcer cases. Venous ulcers develop mostly along the medial distal leg, and can be very painful.