Sometimes we have been told we should have enough faith to be healed by God without medicine...but what if medicine is the plan God has desired? There are quite a few accounts where God used "medicine" in the Bible to heal someone, even if it was the mud made from the spit of Christ.
"Isaiah said, 'Prepare a poultice of figs.' They did so and applied it to [Hezekiah's] boil, and he recovered." - 2 Kings 20:7