Leviticus 13:26-28

New King James Version

²⁶ But if the priest examines it, and indeed there are no white hairs in the bright spot, and it is not deeper than the skin, but has faded, then the priest shall isolate him seven days. ²⁷ And the priest shall examine him on the seventh day. If it has at all spread over the skin, then the priest shall pronounce him unclean. It is a leprous sore. ²⁸ But if the bright spot stays in one place, and has not spread on the skin, but has faded, it is a swelling from the burn. The priest shall pronounce him clean, for it is the scar from the burn.