Leviticus 13:12-17

12And if the leprous disease breaks out in the skin, so that the leprous disease covers all the skin of the diseased person from head to foot, so far as the priest can see,

13then the priest shall look, and if the leprous disease has covered all his body, he shall pronounce him clean of the disease; it has all turned white, and he is clean.

14But when raw flesh appears on him, he shall be unclean.

15And the priest shall examine the raw flesh and pronounce him unclean. Raw flesh is unclean, for it is a leprous disease.

16But if the raw flesh recovers and turns white again, then he shall come to the priest,

17and the priest shall examine him, and if the disease has turned white, then the priest shall pronounce the diseased person clean; he is clean.