Leviticus 13:29–37

“If a man or woman has a sore on their head^z or chin, the priest is to examine the sore, and if it appears to be more than skin deep and the hair in it is yellow and thin, the priest shall pronounce them unclean; it is a defiling skin disease on the head or chin. But if, when the priest examines the sore, it does not seem to be more than skin deep and there is no black hair in it, then the priest is to isolate the affected person for seven days.^a On the seventh day the priest is to examine the sore,^b and if it has not spread and there is no yellow hair in it and it does not appear to be more than skin deep, then the man or woman must shave themselves, except for the affected area, and the priest is to keep them isolated another seven days. On the seventh day the priest is to examine the sore,^c and if it has not spread in the skin and appears to be no more than skin deep, the priest shall pronounce the man or woman clean. They must wash their clothes, and they will be clean.^d But if the sore does spread in the skin after they are pronounced clean, the priest is to examine them, and if he finds that the sore has spread in the skin, he does not need to look for yellow hair; they are unclean.^e If, however, the sore is unchanged so far as the priest can see, and if black hair has grown in it, the affected person is healed. They are clean, and the priest shall pronounce them clean.