Leviticus 13:3 - Albert Barnes' Notes on the Bible

Bible Comments

The hair in the plague is turned white - The sparing growth of very fine whitish hair on leprous spots in the place of the natural hair, appears to have been always regarded as a characteristic symptom.

the plague in sight be deeper than the skin of his flesh - Rather The stroke appears to be deeper than the scarf skin. The bright spot changed to a brownish color with a metallic or oily luster, and with a clearly-defined edge. This symptom, along with the whitish hair, at once decided the case to be one of leprosy.

Leviticus 13:3

3 And the priest shall look on the plague in the skin of the flesh: and when the hair in the plague is turned white, and the plague in sight be deeper than the skin of his flesh, it is a plague of leprosy: and the priest shall look on him, and pronounce him unclean.