Leviticus 13:24-28

24"Or, when the body has a burn on its skin and the raw flesh of the burn becomes a spot, reddish-white or white,

25the priest shall examine it, and if the hair in the spot has turned white and it appears deeper than the skin, then it is a leprous disease. It has broken out in the burn, and the priest shall pronounce him unclean; it is a case of leprous disease.

26But if the priest examines it and there is no white hair in the spot and it is no deeper than the skin, but has faded, the priest shall shut him up seven days,

27and the priest shall examine him the seventh day. If it is spreading in the skin, then the priest shall pronounce him unclean; it is a case of leprous disease.

28But if the spot remains in one place and does not spread in the skin, but has faded, it is a swelling from the burn, and the priest shall pronounce him clean, for it is the scar of the burn.