Leviticus 13:15-25

15 And the priest shall see the raw flesh and pronounce him to be unclean, for the raw flesh is unclean: it is leprosy.
16 But when the raw flesh turns again and is changed unto white, he shall come unto the priest;
17 and the priest shall see him; and if the plague is turned white; then the priest shall pronounce the one that has the plague clean, and he shall be clean.
18 And when in the flesh, in the skin thereof, there was a boil and is healed,
19 and in the place of the boil there is a white rising or a bright spot, white, and somewhat reddish, it shall be shown to the priest;
20 and the priest shall look, and if it appears to be lower than the skin and the hair thereof is turned white; the priest shall pronounce him unclean; it is a plague of leprosy broken out of the boil.
21 But if the priest considers it and there appear to be no white hairs in it and it is not lower than the skin, but somewhat dark, then the priest shall shut him up seven days;
22 and if it spreads much abroad in the skin, then the priest shall pronounce him unclean: it is a plague.
23 But if the bright spot stays in its place and does not spread, it is the scab of a boil; and the priest shall pronounce him clean.
24 Likewise when the flesh has in its skin a burn from fire, and in the place healed from the burn there a white bright spot, somewhat reddish, or white,
25 then the priest shall look upon it; and if the hair in the bright spot is turned white and it looks deeper than the skin, it is a leprosy broken out of the burn; and the priest shall pronounce him unclean; it is the plague of leprosy.