Matthew Poole and continuators on Leviticus 13:14

14 But when the raw flesh appeareth in him , he shall be unclean.

Or rather, in it, i. e. in the place where the sign or appearance of leprosy was, when the flesh was partly changed into a whiter colour, and partly kept its natural colour, this variety of colours was an evidence of the leprosy, as one and the same colour continuing was a sign of soundness.