Leviticus 13:9-17

“When a man is afflicted with a leprous disease, he shall be brought to the priest, and the priest shall look. And if there is a white swelling in the skin that has turned the hair white, and there is raw flesh in the swelling, it is a chronic leprous disease in the skin of his body, and the priest shall pronounce him unclean. He shall not shut him up, for he is unclean. And if the leprous disease breaks out in the skin, so that the leprous disease covers all the skin of the diseased person from head to foot, so far as the priest can see, then the priest shall look, and if the leprous disease has covered all his body, he shall pronounce him clean of the disease; it has all turned white, and he is clean. But when raw flesh appears on him, he shall be unclean. And the priest shall examine the raw flesh and pronounce him unclean. Raw flesh is unclean, for it is a leprous disease. But if the raw flesh recovers and turns white again, then he shall come to the priest, and the priest shall examine him, and if the disease has turned white, then the priest shall pronounce the diseased person clean; he is clean.