Leviticus 13:9-17

9When anyone develops a skin disease, he must be brought to the priest. 10The priest will examine him, and if there is a white swelling on the skin that has turned the hair white, and there is raw flesh in the swelling, 11it is a chronic skin disease and the priest must pronounce him unclean. He need not isolate him, for he is unclean.

12But if the skin disease breaks out all over his skin so that it covers all the skin of the infected person from head to foot, as far as the priest can see, 13the priest shall examine him, and if the disease has covered his entire body, he is to pronounce the infected person clean. Since it has all turned white, he is clean.

14But whenever raw flesh appears on someone, he will be unclean. 15When the priest sees the raw flesh, he must pronounce him unclean. The raw flesh is unclean; it is a skin disease. 16But if the raw flesh changes and turns white, he must go to the priest. 17The priest will reexamine him, and if the infection has turned white, the priest is to pronounce the infected person clean; then he is clean.