Leviticus 13:15

“And the priest shall see the raw flesh, etc.] Or when he sees it, the person being brought to him to be viewed: and pronounce him to be unclean; or shall pronounce him to be unclean: [for] the raw flesh [is] unclean; made a man so in a ceremonial sense; (see Gill on “<031310>Leviticus 13:10”); it [is] a leprosy; wherever any quick raw flesh appears in a swelling.”

“The disease here indicated appears to be that now known as Lepra commonis, the common White Leprosy, or Dry Tetter. It first shows itself in reddish pimples, the surface of which becomes white and scaly, spreading in a circular form until they meet each other and cover large patches of the body. It scarcely affects the general health, and for the most part disappears of itself, though it often lasts for years. From his head even to his foot, wheresoever. the priest looketh - The first appearance of the Lepra Commonis may take place in any part of the body, especially, however, at the larger joints of the limbs; but the spots of elephantiasis are almost always first seen, on those parts which…”

“The raw flesh - This is repeated again and again, because raw or living flesh might rather seem a sign of soundness, and the priest might easily be deceived by it, and therefore he was more narrowly to look into it. Leviticus 13:16”