Leviticus 13:17-21

¹⁷and the priest shall see him, and, behold, if the plague is turned white, then the priest shall pronounce the patient clean: he is clean.

¹⁸And if the flesh should have become an ulcer in his skin, and should be healed,

¹⁹and there should be in the place of the ulcer a white sore, or one looking white and bright, or fiery, and it shall be seen by the priest;

²⁰then the priest shall look, and, behold, if the appearance be beneath the skin, and its hair has changed to white, then the priest shall pronounce him unclean; because it is a leprosy, it has broken out in the ulcer.

²¹But if the priest look, and behold there is no white hair on it, and it be not below the skin of the flesh, and it be dark-colored; then the priest shall separate him seven days.