Leviticus 13:12-17

12And 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; 13then 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. 14But whensoever raw flesh appeareth in him, he shall be unclean. 15And the priest shall look on the raw flesh, and pronounce him unclean: the raw flesh is unclean: it is leprosy. 16Or if the raw flesh turn again, and be changed unto white, then he shall come unto the priest; 17and 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.