<prompt> What is the most likely diagnosis?CandidiasisGeographic tongueHerpes zosterLichen planus  <response>: Answer C. Herpes zoster The vesicular eruptions along the V3 trigeminal dermatome, including the left side of the tongue and mandible, are most consistent with a diagnosis of herpes zoster infection. The patient was prescribed a 2-week course of oral valacyclovir. 