Leviticus 13:7

after that he hath shewn himself to the priest for his cleansing i.e. in order to be declared clean. Three inspections by the priest are ordered with a week's interval between each. If during either week the rising spreads, the priest shall pronounce him unclean.

It will be noticed that the word -plague" is used to denote the rising or scab which is a mark of the leprosy, and also the person afflicted (in Leviticus 13:4; Leviticus 13:12; Leviticus 13:17him that hathis not in the Heb.), as well as the disease itself in the phrase -the plague of leprosy."