Leviticus 13:24-28

24Or if there is any flesh, in the skin of which there is a hot burning, and the live flesh that burneth hath a white bright spot, somewhat reddish, or white;1 25Then the priest shall look upon it: and, behold, if the hair in the bright spot is turned white, and it is in sight deeper than the skin; it is a leprosy broken out of the burning: therefore the priest shall pronounce him unclean: it is the plague of leprosy. 26But if the priest shall look on it, and, behold, there is no white hair in the bright spot, and it is no lower than the other skin, but is somewhat dark; then the priest shall shut him up seven days: 27And the priest shall look upon him the seventh day: and if it is spread much in the skin, then the priest shall pronounce him unclean: it is the plague of leprosy. 28And if the bright spot shall stay in its place, and not spread in the skin, but be somewhat dark; it is a swelling of the burning, and the priest shall pronounce him clean: for it is an inflammation of the burning.