Leviticus 13:9-17

“Whenever someone has a serious and infectious skin disease, you must bring him to the priest. The priest will examine him; if there is a white swelling in the skin, the hair is turning white, and there is an open sore in the swelling, it is a chronic skin disease. The priest will pronounce him unclean. But he doesn’t need to quarantine him because he’s already given his diagnosis of unclean. If a serious disease breaks out that covers all the skin from head to foot, wherever the priest looks, the priest will make a thorough examination; if the disease covers his entire body, he will pronounce the person with the sore clean—since it has turned all white, he is clean. But if they are open, running sores, he is unclean. The priest will examine the open sores and pronounce him unclean. The open sores are unclean; they are evidence of a serious skin disease. But if the open sores dry up and turn white, he is to come back to the priest who will reexamine him; if the sores have turned white, the priest will pronounce the person with the sores clean. He is clean.