Leviticus 13:40-44

“When a man loses his hair and goes bald, he is clean. If he loses his hair from his forehead, he is bald and he is clean. But if he has a reddish-white sore on scalp or forehead, it means a serious skin disease is breaking out. The priest is to examine it; if the swollen sore on his scalp or forehead is reddish-white like the appearance of the sore of a serious skin disease, he has a serious skin disease and is unclean. The priest has to pronounce him unclean because of the sore on his head.