Does a ham need to be covered when cooking?

When ham is reheated properly, it should be done so at a low temperature for a prolonged period of time. If the ham is cooked while uncovered, the moisture that is contained inside it will evaporate, leaving the ham dry and unappetizing. Take note of this advice: In a baking dish, lay the ham with the sliced side facing down. Until it is time to glaze the ham, keep it warm by covering it with foil or using a baking bag and placing it in the oven.