Mr Hammond is 70 years old and presents with a one day history of a painful right ear and vertigo. He feels his hearing is not as good in that ear but admits he often has build of earwax in both ears needing regular syringing. Past medical history includes Psoriasis and Migraine. On examination he has a vesicular rash in his right ear canal and the tympanic membrane looks intact.
Based on the likely diagnosis, which additional feature on examination would you most likely see?