Leviticus 13:42-43

But if there is on the bald head or the bald forehead a reddish-white diseased area, it is a leprous disease breaking out on his bald head or his bald forehead. Then the priest shall examine him, and if the diseased swelling is reddish-white on his bald head or on his bald forehead, like the appearance of leprous disease in the skin of the body