Leviticus 13:40-44

40“If a man loses the hair on his head, he is bald, but he is clean.

41And if he loses the hair on front of his head, he is bald on the forehead, but he is clean.

42But if there is a reddish-white infection on the bald head or forehead, it is leprosy breaking out on his bald head or forehead.

43Then the priest shall examine him, and if the diseased swelling is reddish-white on his bald head or forehead like the appearance of leprosy on the skin of the body,

44he is a leprous man; he is unclean; the priest shall most certainly pronounce him unclean; his disease is on his head.