"But in the day when proud flesh appears upon him, he is unclean,...the proud flesh is unclean; it is leprosy." That is to say, if proud flesh appeared after the body had been covered with a white scurf, with which the diseased matter had apparently exhausted itself, the disease was not removed, and the person affected with it was to be pronounced unclean.

The third case: if the leprosy proceeded from an abscess which had been cured. In Leviticus 13:18 בּשׂר is first of all used absolutely, and then resumed with בּו, and the latter again is more closely defined in בּעורו: "if there arises in the flesh, in him, in his skin, an abscess, and (it) is healed, and there arises in the place of the abscess a white elevation, or a spot of a reddish white, he (the person so affected) shall appear at the priest's."

Leviticus 13:22 Parallel Commentaries

a plague. i,e. `The plague of leprosy.'