Leviticus 13:21-23

New Century Version

²¹ But if the priest looks at the spot and there are no white hairs in it and the spot is not deeper than the skin and it has faded, the priest must separate the person from other people for seven days. ²² If the spot spreads on the skin, the priest must announce that the person is unclean; it is a disease that will spread. ²³ But if the bright spot does not spread or change, it is only the scar from the old boil. Then the priest must announce that the person is clean.