Leviticus 13:14 - Joseph Benson’s Commentary on the Old and New Testaments

When raw (Hebrew, when living) flesh appeareth in him That is, when some of the flesh appears in its sound and natural state, the rest of the skin being white. This was a token of nature's being unable to throw out all the leprous humour into the skin, and of its working inwardly. Consequently the person in that state was to be pronounced unclean.