Leviticus 13:18-23

18And when the flesh hath in the skin thereof a boil, and it is healed, 19and in the place of the boil there is a white rising, or a bright spot, reddish-white, then it shall be showed to the priest; 20and the priest shall look; and, behold, if the appearance thereof be lower than the skin, and the hair thereof be turned white, then the priest shall pronounce him unclean: it is the plague of leprosy, it hath broken out in the boil. 21But if the priest look on it, and, behold, there be no white hairs therein, and it be not lower than the skin, but be dim; then the priest shall shut him up seven days: 22and if it spread abroad in the skin, then the priest shall pronounce him unclean: it is a plague. 23But if the bright spot stay in its place, and be not spread, it is the scar of the boil; and the priest shall pronounce him clean.