Leviticus 13:24-28

24“If anyone has a burn on his skin and the raw flesh of the burn turns into a pink or bright white area,

25the priest will examine it. If the hair on the affected area has turned white and the affected area looks deeper than the rest of the skin, an infectious skin disease has developed in the burn. The priest must declare him unclean. It is an infectious skin disease.

26But if the priest examines it and the hair in it is not white and the affected area is not deeper than the rest of the skin but has faded, the priest must put him in isolation for seven days.

27On the seventh day the priest will examine him again. If the area has spread, the priest must declare him unclean. It is an infectious skin disease.

28If the irritated area does not spread but has faded, it is only a sore caused by the burn. The priest must declare him clean, because it is a scar caused by the burn.