Leviticus 13:22-26

and if it spreads farther on the skin, then the priest shall pronounce him unclean; it is an infection.

But if the bright spot remains in its place and does not spread, it is only the scar of the boil; and the priest shall pronounce him clean.

“Or if the body sustains in its skin a burn by fire, and the raw flesh of the burn becomes a bright spot, reddish-white, or white,

then the priest shall look at it. And if the hair in the bright spot has turned white and it appears to be deeper than the skin, it is leprosy; it has broken out in the burn. Therefore, the priest shall pronounce him unclean; it is an infection of leprosy.

But if the priest looks at it, and indeed, there is no white hair in the bright spot and it is no deeper than the skin, but is dim, then the priest shall isolate him for seven days;