Leviticus 13:18-20

18“When the 1body has a boil on its skin and it is healed,

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

20and the priest shall look, and behold, if 2it appears to be lower than the skin, and the hair on it has turned white, then the priest shall pronounce him unclean; it is the infection of leprosy, it has broken out in the boil.