Leviticus 13
19 Ref and in the place of the boil there is a white rising, or a bright spot, reddish-white, then is shall be showed to the priest;
20 Ref and the priest shall look; and, behold, if the appearance thereof be lower than the skin, and the hair thereof be turned white, then the priest shall pronounce him unclean: it is the plague of leprosy, it hath broken out in the boil.