You’ve been sitting in the car on a long journey, when you get out of the car to go to the bathroom at the rest stop, you notice that your right calf is hurting. You don’t pay much attention to it, figuring it is stiff from being in the car. You go to the bathroom, get your snack and get back on the road. Later, once you’ve stopped driving for the day and get to your hotel for the night, now not only is your calf hurting, but it is swollen and red. What is going on? What is wrong with your leg?