Leviticus 13:20-22

American Standard Version

²⁰ and 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. ²¹ But 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: ²² and if it spread abroad in the skin, then the priest shall pronounce him unclean: it is a plague.