Leviticus 13:23

20 and the priest hath seen, and lo, its appearance is lower than the skin, and its hair hath turned white, and the priest hath pronounced him unclean; it is a plague of leprosy--in an ulcer it hath broken out.

21 `And if the priest see it, and lo, there is no white hair in it, and it is not lower than the skin, and is become weak, then hath the priest shut him up seven days;

22 and if it spread greatly in the skin, then hath the priest pronounced him unclean, it is a plague;

23 and if in its place the bright spot stay--it hath not spread--it is an inflammation of the ulcer; and the priest hath pronounced him clean.

24 `Or when flesh hath in its skin a fiery burning, and the quickening of the burning, the bright white spot, hath been very red or white,

25 and the priest hath seen it, and lo, the hair hath turned white in the bright spot, and its appearance is deeper than the skin; leprosy it is, in the burning it hath broken out, and the priest hath pronounced him unclean; it is a plague of leprosy.

26 `And if the priest see it, and lo, there is no white hair on the bright spot, and it is not lower than the skin, and it is become weak, then the priest hath shut him up seven days;