Leviticus 13:17-21

¹⁷and the priest shall look on him, and behold, the sore is turned white; then the priest shall pronounce him clean that hath the sore: he is clean.

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;