וְאִם־פָּשֹׂ֥ה תִפְשֶׂ֖ה בָּע֑וֹר וְטִמֵּ֧א הַכֹּהֵ֛ן אֹת֖וֹ נֶ֥גַע הִֽוא׃
And if it spread abroad in the skin, then the priest shall pronounce him unclean: it is a plague.
Targum Jonathan on Leviticus
And the priest shall look on the seventh day; and if it hath gone on widening in the skin, the priest shall make him to be unclean; for it is the plague of leprosy.