Leviticus 13:16

14But when raw flesh appeareth in him, he shall be unclean.

15And the priest shall see the raw flesh, and pronounce him to be unclean: for the raw flesh is unclean: it is a leprosy.

16Or if the raw flesh turn again, and be changed unto white, he shall come unto the priest;

17And the priest shall see him: and, behold, if the plague be turned into white; then the priest shall pronounce him clean that hath the plague: he is clean.

18The flesh also, in which, even in the skin thereof, was a boil, and is healed,