A poultice of figs,

God's natural medicine

Divine direction.

-Isaiah 38:21

Natural medicine. I keep a book in my kitchen called The Top 100 Traditional Remedies by Sarah Merson. I love reading about the good stuff I'm doing for my body when I eat healthy. I recently learned an interesting fact about figs. When applied topically they draw out poison. This fact became even more intersting to me when I read Isaiah yesterday. God is not against natural medicine. Sometimes that's His way of bringing recovery to us. Who made figs with poison drawing properties? He did. Here are a few other gems He put here for our good:

blackstrap molasses: full of iron and other minerals, an immune booster, useful in treating dry coughs (and no medicine hangover the next day)
cinnamon: antiviral and antifungal, great for fighting colds and flus, warming properties increase body temperature and can be useful in breaking a fever.
strawberries: iron rich fruit, full of vitamins including C, cleans tartar deposits off teeth.
oatmeal: a multitude of health benefits including mood enhancer, "...a reliable treatment for depression."

Supernatural medicine. King Hezekiah's cure was not only natural. The first verse of chapter 38 makes that clear. Isaiah's first message to the king was, "Put your house in order because you will die and not live." Hezekiah wept and prayed, and God sent Isaiah back to tell the king, "I have heard your prayer, I have seen your tears; behold I will add fifteen years to your life...apply a cake of figs to the boil."
God gave Hezekiah a natural remedy and then supernaturally causes the sundail to go backward ten steps as a sign that he will heal Hezekiah and deliver Jerusalem from the Assyrians. Seems like it would have been just as easy for God to supernaturally, instantaneously remove the poison from Hezekiah's body as it was to move the sun's shadow backwards. But God does things as He sees fit, not as we do.

Whatever method He uses God is, was and will always be our healer. Psalm 103:3

Isaiah 53:4-5 (Jewish Publication Society Bible): "Surely our diseases he did bear, and our pains he carried; whereas we did esteem him stricken, smitten of God, and afflicted. But he was wounded because of our transgressions, he was crushed because of our iniquities: the chastisement of our welfare was upon him, and with his stripes we were healed."