Dependent rubor: Is a possibility. Venous insufficiency or incompetent valves cause blood to pool and this is often bluish in color when looking at the feet,
Answered 3/18/2019
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Due to veins: When you sit it seems that you are clotting a vein temporarily. As the blood accumulates the leg get more swollen and it turns that color. Many times patients also feel numbness, this is due to that vein pressure compressing the sensory nerves.
Answered 3/10/2021
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