Leviticus 13:24-28

24“When there is a burn on the skin of one’s body produced by fire, and the patch made raw by the burn becomes reddish-white or white,

25the priest is to examine it. If the hair in the spot has turned white and the spot appears to be deeper than the skin, it is a serious skin disease that has broken out in the burn. The priest must pronounce him unclean; it is a serious skin disease.

26But when the priest examines it, if there is no white hair in the spot and it is not beneath the skin but is faded, the priest will quarantine him seven days.

27The priest will reexamine him on the seventh day. If it has spread further on the skin, the priest must pronounce him unclean; it is in fact a case of serious skin disease.

28But if the spot has remained where it was and has not spread on the skin but is faded, it is the swelling from the burn. The priest is to pronounce him clean, for it is only the scar from the burn.