Leviticus 13:7, 27
Leviticus 13:7 NIV
But if the rash does spread in their skin after they have shown themselves to the priest to be pronounced clean, they must appear before the priest again.
Leviticus 13:27 NIV
On the seventh day the priest is to examine that person, and if it is spreading in the skin, the priest shall pronounce them unclean; it is a defiling skin disease.