A 60-year-old man reports a 2-day history of intense pain in his left ear accompanied by a burning feeling and a loss of taste. He also exhibits weakness on the left side of both his upper and lower facial muscles, while facial sensation remains intact. Several vesicles are observed in the throat. What is the most probable diagnosis?

Explanation

The presence of ear pain, facial muscle weakness, loss of taste, and vesicular lesions in the pharynx strongly suggests Ramsay Hunt syndrome, which is caused by reactivation of the varicella-zoster virus affecting the facial nerve. Bell’s palsy typically lacks vesicles and ear pain. Acoustic neuroma causes gradual hearing loss without vesicles. Diphtheria does not cause facial paralysis with vesicles. Trigeminal neuralgia involves facial pain but not weakness or vesicles.