Leviticus 13:23

But if the priest look on it, and, behold, [there be] no white hairs therein, and [if] it [be] not lower than the skin, but [be] somewhat dark; then the priest shall shut him up seven days:

And if it spread much abroad in the skin, then the priest shall pronounce him unclean: it [is] a plague.

Or if there be [any] flesh, in the skin whereof [there is] a hot burning, and the quick [flesh] that burneth have a white bright spot, somewhat reddish, or white;

Then the priest shall look upon it: and, behold, [if] the hair in the bright spot be turned white, and it [be in] sight deeper than the skin; it [is] a leprosy broken out of the burning: wherefore the priest shall pronounce him unclean: it [is] the plague of leprosy.