Leviticus 13:23

The priest shall examine it. Behold, if its appearance is deeper than the skin, and its hair has turned white, then the priest shall pronounce him unclean. It is the plague of leprosy. It has broken out in the boil.

But if the priest examines it, and behold, there are no white hairs in it, and it isn’t deeper than the skin, but is dim, then the priest shall isolate him seven days.

If it spreads in the skin, then the priest shall pronounce him unclean. It is a plague.

“Or when the body has a burn from fire on its skin, and the raw flesh of the burn becomes a bright spot, reddish-white, or white,

then the priest shall examine it; and behold, if the hair in the bright spot has turned white, and its appearance is deeper than the skin, it is leprosy. It has broken out in the burning, and the priest shall pronounce him unclean. It is the plague of leprosy.

But if the priest examines it, and behold, there is no white hair in the bright spot, and it isn’t deeper than the skin, but has faded, then the priest shall isolate him seven days.