Leviticus 13:21-23

New King James Version

²¹ But if the priest examines it, and indeed there are no white hairs in it, and it is not deeper than the skin, but has faded, then the priest shall isolate him seven days; ²² and if it should at all spread over the skin, then the priest shall pronounce him unclean. It is a ^[a]leprous sore. ²³ But if the bright spot stays in one place, and has not spread, it is the scar of the boil; and the priest shall pronounce him clean.