Leviticus 13:21-23

New Catholic Bible

²¹ But if the priest, upon examining it, sees that it does not have white hair and it is not deeper than the skin, but rather it is a bit darker, then the priest shall quarantine him for seven days. ²² If it spreads over the skin, then the priest shall declare him to be unclean, for the spot is leprous. ²³ But if the spot stays put and does not spread, then it is a scar from the boil and the priest shall declare him to be clean.