Leviticus 13:18-28

“If anyone has a boil on the skin that has started to heal, but a white swelling or a reddish white spot develops in its place, that person must go to the priest to be examined. If the priest examines it and finds it to be more than skin-deep, and if the hair in the affected area has turned white, the priest must pronounce the person ceremonially unclean. The boil has become a serious skin disease. But if the priest finds no white hair on the affected area and the problem appears to be no more than skin-deep and has faded, the priest must quarantine the person for seven days. If during that time the affected area spreads on the skin, the priest must pronounce the person ceremonially unclean, because it is a serious disease. But if the area grows no larger and does not spread, it is merely the scar from the boil, and the priest will pronounce the person ceremonially clean. “If anyone has suffered a burn on the skin and the burned area changes color, becoming either reddish white or shiny white, the priest must examine it. If he finds that the hair in the affected area has turned white and the problem appears to be more than skin-deep, a skin disease has broken out in the burn. The priest must then pronounce the person ceremonially unclean, for it is clearly a serious skin disease. But if the priest finds no white hair on the affected area and the problem appears to be no more than skin-deep and has faded, the priest must quarantine the infected person for seven days. On the seventh day the priest must examine the person again. If the affected area has spread on the skin, the priest must pronounce that person ceremonially unclean, for it is clearly a serious skin disease. But if the affected area has not changed or spread on the skin and has faded, it is simply a swelling from the burn. The priest will then pronounce the person ceremonially clean, for it is only the scar from the burn.