Leviticus 13:9-17

When the plague of leprosy is in a man, then he shall be brought unto the priest; and the priest shall look; and, behold, if there be a white rising in the skin, and it have turned the hair white, and there be quick raw flesh in the rising, 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. 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; 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. But whensoever raw flesh appeareth in him, he shall be unclean. And the priest shall look on the raw flesh, and pronounce him unclean: the raw flesh is unclean: it is leprosy. Or if the raw flesh turn again, and be changed unto white, then he shall come unto the priest; 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.