Leviticus 13:9-17

“When the infection of leprosy is on a man, then he shall be brought to the priest. The priest shall then look, and if there is a white swelling in the skin, and it has turned the hair white, and there is quick raw flesh in the swelling, it is a chronic leprosy on the skin of his body, and the priest shall pronounce him unclean; he shall not isolate him, for he is unclean. If the leprosy breaks out farther on the skin, and the leprosy covers all the skin of him who has the infection from his head even to his feet, as far as the priest can see, then the priest shall look, and behold, if the leprosy has covered all his body, he shall pronounce clean him who has the infection; it has all turned white and he is clean. But whenever raw flesh appears on him, he shall be unclean. The priest shall look at the raw flesh, and he shall pronounce him unclean; the raw flesh is unclean, it is leprosy. Or if the raw flesh turns again and is changed to white, then he shall come to the priest, and the priest shall look at him, and behold, if the infection has turned to white, then the priest shall pronounce clean him who has the infection; he is clean.