A 11-year-old patient comes in with a parent complaining of…

A 11-year-old patient comes in with a parent complaining of left ear pain, discomfort, and tenderness. On exam, you note that the left tragus is tender to touch; the ear canal is erythematous and edematous with a moderate amount of purulent drainage; and that the tympanic membrane is intact without erythema or effusion. You diagnose this patient with: