A lump of figs - The usual remedy in the East, even at the present day, for ordinary boils. But such a remedy would not naturally cure the dangerous tumor or carbuncle from which Hezekiah suffered. Thus the means used in this miracle were means having a tendency toward the result performed by them, but insufficient of themselves to produce that result (compare 2 Kings 4:34 note).
Related Commentaries of 2 Kings 20:7
2 Kings 20:7
7 And Isaiah said, Take a lump of figs. And they took and laid it on the boil, and he recovered.