34On the seventh day the priest shall examine the scaly outbreak, and if it has not spread on the skin and does not appear to be deeper than the skin, the priest is to pronounce him clean. He must wash his clothes, and he will be clean.
35If, however, the scaly outbreak spreads further on the skin after his cleansing,
36the priest is to examine him, and if the scaly outbreak has spread on the skin, the priest need not look for yellow hair; the person is unclean.
37If, however, in his sight the scaly outbreak is unchanged and black hair has grown in it, then it has healed. He is clean, and the priest is to pronounce him clean.
— Leviticus 13:34-37