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 are habitually exposed, the face, ears and hands.
Raw flesh - See Leviticus 13:10.
Boil - Probably ulcer. In Job 2:7, and Deuteronomy 28:27, Deuteronomy 28:35, it would seem highly probable that the word expresses the ulcers of elephantiasis.