Leviticus 13:9-17

“When a leprous infection is on a person, he shall be brought to the priest. The priest shall examine him, and if there is a white swelling on the skin and it has turned the hair white and there is new 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 because he is [clearly] unclean. But if the [suspected] leprosy breaks out farther on the skin, and it covers all of the skin of the one who has the outbreak—from his head to his foot—wherever the priest looks, the priest shall examine him. If the [suspected] leprosy has covered his entire body, he shall pronounce him clean of the disease; it has all turned white, and he is clean. But whenever raw flesh appears on him, he shall be unclean. The priest shall examine the raw flesh, and he shall pronounce him unclean; the raw flesh is unclean, it is leprosy. But if the raw flesh turns again and is changed to white, then he shall come to the priest, and the priest shall examine him, and if the diseased part is changed to white, then the priest shall pronounce him who had the disease to be clean; he is clean.