Leviticus 13:40-44

40Now if a man loses his hair and is bald, he is still clean. 41Or if his hairline recedes and he is bald on his forehead, he is still clean. 42But if there is a reddish-white sore on the bald head or forehead, it is an infectious disease breaking out on it. 43The priest is to examine him, and if the swelling of the infection on his bald head or forehead is reddish-white like a skin disease, 44the man is diseased; he is unclean. The priest must pronounce him unclean because of the infection on his head.