20 then the priest shall look, and, behold, if the appearance be beneath the skin, and its hair has changed to white, then the priest shall pronounce him unclean; because it is a leprosy, it has broken out in the ulcer.
Leviticus 13:20 Cross References - Brenton
Leviticus 13:3
3 And the priest shall view the spot in the skin of his flesh; and if the hair in the spot be changed to white, and the appearance of the spot be below the skin of the flesh, it is a plague of leprosy; and the priest shall look upon it, and pronounce him unclean.