Simply put Stasis Demetitis is defined as skin changes caused by fluid build up under the skin. Varicose veins, congestive heart failure and OTHER conditions CAN cause swelling of the extremities. In SD the skin becomes thin and inflamed and open ulcers may form and heal slowly. The skin may darken. Initially the skin will be thin, may later thicken, perhaps becasue of itching and scratching the area.
What you described for the color is common.
In addition to the diurectic, elevating the legs above the level of the heart can reduce the edema and elastic (support hose) stockings may improve blood return from the legs.