Leviticus 13:40-44

And if a man’s hair be fallen off his head, he is bald; yet is he clean. And if his hair be fallen off from the front part of his head, he is forehead bald; yet is he clean. But if there be in the bald head, or the bald forehead, a reddish-white plague; it is leprosy breaking out in his bald head, or his bald forehead. Then the priest shall look upon him; and, behold, if the rising of the plague be reddish-white in his bald head, or in his bald forehead, as the appearance of leprosy in the skin of the flesh; he is a leprous man, he is unclean: the priest shall surely pronounce him unclean; his plague is in his head.