A 60-year-old diabetic male presents to your clinic for right ear pain. The patient reports noting worsening right ear pain for three weeks, purulent otorrhea initially which has resolved, and facial asymmetry for the past several days. He reports being poorly compliant with his diabetes medication regimen. His temperature is 100.4 deg F (38 deg C), blood pressure is 140/90 mmHg, pulse is 90/min, and respirations are 18/min. On physical exam, the patient’s right external auditory canal is noted to have granulation tissue at the bony cartilaginous junction. He is also noted to have right facial droop. Which of the following is the best next step in treatment?