Venous stasis: Most likely reason is slow return of blood from the leg due to poor venous circulation. You may have incompetent venous valves on deeper veins and even if not having visible varicosities this could be present. Usually it causes swelling of the foot and ankle by the end of the day and better in the morning. Leg elevation and support stockings would help. The pigment is hemoglobin that escapes.
Answered 5/6/2018
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