Leviticus 13:24-28

“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;

and the priest shall look at him on the seventh day. If it spreads farther in the skin, then the priest shall pronounce him unclean; it is an infection of leprosy.

But if the bright spot remains in its place and has not spread in the skin, but is dim, it is the swelling from the burn; and the priest shall pronounce him clean, for it is only the scar of the burn.