The following is the commonest site for venous ulcer
Venous ulcers usually lie just proximal to the medial or lateral malleolus. Venous ulcers are accompanied by lipodermatosclerosis and hemosiderosis (if these are not present then the ulcer is probably not of venous origin). Ref : Bailey & Love 25/e p937
Sole of foot
Lower 2/3 of leg
Lower 1/3 of leg and ankle
Middle 1/3 of leg
Vascular surgery