This was rather a sign appointed by God, than a natural means of the cure; for if it had a natural faculty to ripen a sore, yet it could never cure such a dangerous and pestilential disease, at least in so little time.
Related Commentaries of Isaiah 38:21
Isaiah 38:21
21 For Isaiah had said, Let them take a lump of figs, and lay it for a plaister upon the boil, and he shall recover.