Leviticus 13:18-23

18And the flesh — when in the skin thereof cometh a boil, and it is healed,

19and there is in the place of the boil a white rising, or a white-reddish bright spot, it shall be shewn to the priest;

20and the priest shall look on it, and behold, it looketh deeper than the skin, and the hair thereof is turned white; then the priest shall pronounce him unclean: it is the sore of leprosy broken out in the boil.

21But if the priest look on it, and behold, there are no white hairs therein, and it is not deeper than the skin, and is pale, the priest shall shut him up seven days;

22and if it spread much in the skin, then the priest shall pronounce him unclean: it is the sore.

23But if the bright spot have remained in its place, [and] have not spread, it is the scar of the boil; and the priest shall pronounce him clean.