Leviticus 13:25-27

New King James Version

²⁵ then the priest shall examine it; and indeed if the hair of the bright spot has turned white, and it appears deeper than the skin, it is leprosy broken out in the burn. Therefore the priest shall pronounce him unclean. It is a leprous sore. 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.