Leviticus 13:18-23

18The flesh also, in which, even in the skin of it, was a boil, and is healed, 19And in the place of the boil there shall be a white swelling, or a bright spot, white, and somewhat reddish, and it be showed to the priest; 20And if, when the priest seeth it, behold, it is in sight lower than the skin, and the hair of it is turned white; the priest shall pronounce him unclean: it is a plague of leprosy broken out of the boil. 21But if the priest shall look on it, and, behold, there are no white hairs in it, and if it is not lower than the skin, but somewhat dark; then the priest shall shut him up seven days: 22And if it hath spread much in the skin, then the priest shall pronounce him unclean: it is a plague. 23But if the bright spot shall stay in its place, and not spread, it is a burning boil; and the priest shall pronounce him clean.