Leviticus 13:24-28

“When a person has a burn on his skin and the raw flesh turns into a reddish-white or white shiny spot, the priest is to examine it. If the hair has turned white in the shiny spot and it looks like it’s more than skin deep, a serious skin disease has erupted in the area of the burn. The priest will pronounce him unclean; it is a serious skin disease and infectious. But if on examination there is no white hair in the shiny spot and it doesn’t look to be more than skin deep but has faded, the priest will put him in quarantine for seven days. On the seventh day the priest will reexamine him. If by then it has spread over the skin, the priest will diagnose him as unclean; it is a serious skin disease and infectious. If by that time the shiny spot has stayed the same and has not spread but has faded, it is only a swelling from the burn. The priest will pronounce him clean; it’s only a scar from the burn.