Leviticus 13:31-33

New Century Version

³¹ But if the priest looks at it and it does not seem deeper than the skin and there is no black hair in it, the priest must separate the person from other people for seven days. ³² On the seventh day the priest must look at the sore. If it has not spread, and there are no yellow hairs growing in it, and the sore does not seem deeper than the skin, ³³ the person must shave himself, but he must not shave the sore place. The priest must separate that person from other people for seven more days.