Leviticus 13:21-23

American Standard Version

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. ²³ But 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.