Leviticus 13:14

11 it is an old leprosy in the skin of his flesh, and the priest shall pronounce him unclean: he shall not shut him up, for he is unclean.

12 And if the leprosy break out abroad in the skin, and the leprosy cover all the skin of [him that hath] the plague from his head even to his feet, as far as appeareth to the priest;

13 then the priest shall look; and, behold, if the leprosy have covered all his flesh, he shall pronounce [him] clean [that hath] the plague: it is all turned white: he is clean.

14 But whensoever raw flesh appeareth in him, he shall be unclean.

15 And the priest shall look on the raw flesh, and pronounce him unclean: the raw flesh is unclean: it is leprosy.

16 Or if the raw flesh turn again, and be changed unto white, then he shall come unto the priest;

17 and the priest shall look on him; and, behold, if the plague be turned into white, then the priest shall pronounce [him] clean [that hath] the plague: he is clean.