It's thin delicate skin, just about as far away from the heart as possible. Leg tattoos can be hard to heal, especially if you won't or can't stay off your feet. I'm NOT a doctor, but if it was me I would prop my foot up as much as possible and put a cold pack on it for 15 minutes at a time every couple of hours. I'd also be taking Advil every 4 hours. I'd call your doctor back.