Leviticus 13:9-17

“If a person has a harmful skin disease, he must be brought to the priest, and the priest must look at him. If there is a white swelling in the skin, and the hair has become white, and the skin looks raw in the swelling, it is a harmful skin disease. It is one he has had for a long time. The priest must announce that the person is unclean. He will not need to separate that person from other people, because everyone already knows that the person is unclean. “If the skin disease spreads all over a person’s body, covering his skin from his head to his feet, as far as the priest can see, the priest must look at the person’s whole body. If the priest sees that the disease covers the whole body and has turned all of the person’s skin white, he must announce that the person is clean. “But when the person has an open sore, he is unclean. When the priest sees the open sore, he must announce that the person is unclean. The open sore is not clean; it is a harmful skin disease. If the open sore becomes white again, the person must come to the priest. The priest must look at him, and if the sores have become white, the priest must announce that the person with the sores is clean. Then he will be clean.