Leviticus 13:9-17

“When the leprous sore is on a person, then he shall be brought to the priest. And the priest shall examine him; and indeed if the swelling on the skin is white, and it has turned the hair white, and there is a spot of raw flesh in the swelling, it is an old leprosy on the skin of his body. The priest shall pronounce him unclean, and shall not isolate him, for he is unclean. “And if leprosy breaks out all over the skin, and the leprosy covers all the skin of the one who has the sore, from his head to his foot, wherever the priest looks, then the priest shall consider; and indeed if the leprosy has covered all his body, he shall pronounce him clean who has the sore. It has all turned white. 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 to be unclean; for the raw flesh is unclean. It is leprosy. Or if the raw flesh changes and turns white again, he shall come to the priest. And the priest shall examine him; and indeed if the sore has turned white, then the priest shall pronounce him clean who has the sore. He is clean.