27 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.

Read Leviticus 13:27 Using Other Translations

And the priest shall look upon him the seventh day: and if it be spread much abroad in the skin, then the priest shall pronounce him unclean: it is the plague of leprosy.
and the priest shall examine him the seventh day. If it is spreading in the skin, then the priest shall pronounce him unclean; it is a case of leprous disease.
On the seventh day the priest must examine the person again. If the affected area has spread on the skin, the priest must pronounce that person ceremonially unclean, for it is clearly a serious skin disease.