Leviticus 13:18-20

18The flesh also, in which, even in the skin thereof, was a boil, and is healed, 19And in the place of the boil there be a white rising, or a bright spot, white, and somewhat reddish, and it be shewed to the priest; 20And if, when the priest seeth it, behold, it be in sight lower than the skin, and the hair thereof be turned white; the priest shall pronounce him unclean: it is a plague of leprosy broken out of the boil.