they could be due to venous stasis because of (lack of movement and muscle tone)..or kidney function disorder... get a kidney function test..and if clear then you should try being a bit active and move as you can walk even with assisting device or person... elevate your legs and try buerger s exercise 1, Elevate feet on padded chair or board for 1/2 to 3 minutes. 2, Sit in relaxed position while each foot is flexed and extended then pronated and supinated for 3 minutes. The feet should become entirely pink. If the feet are blue or painful, elevate them and relax as necessary. 3, Lie quietly for 5 minutes, keeping legs warm with a blanket.