Leviticus 13:4-6

4But if the bright spot is white on the skin of his 1body, and 2it does not appear to be deeper than the skin, and the hair on it has not turned white, then the priest shall 3isolate the person who has the infection for seven days. 5Then the priest shall look at him on the seventh day, and if in his eyes the infection has 4not changed and the infection has not spread on the skin, then the priest shall 5isolate him for seven more days. 6The priest shall then look at him again on the seventh day, and if the infected area has faded and the infection has not spread on the skin, then the priest shall pronounce him clean; it is only a rash. And he shall 6wash his clothes and be clean.