was also present. On examination, cluster of vesicles were present in the left middle and lower third of the face along with cervical lymphadenopathy and redness of skin, thus following the dermatomal rule (Fig. 1). Intraoral examination revealed clusters of shallow ulcers on the left side of the upper buccal mucosa, which were about 3.5 mm in size with erythematous and irregular borders and tissue tags were seen. Shallow ulcers unilaterally on left palatal mucosa were also present (Fig. 2). The left mandibular posterior teeth appeared normal without any dental or periodontal pathology, but tenderness was elicited on percussion with teeth #45, 46. Based on the history of fever, unilateral intense burning pain, and redness on the left side of the face along with the dental pain in the left mandibular posterior teeth, and also the presence of vesicles along the course of the maxillary and mandibular division of trigeminal nerve, it was provisionally diagnosed as HZ of left maxillary and mandibular division of trigeminal nerve. The differential diagnoses included were angioneurotic edema, acute drug eruption and erythema multiforme, pemphigus, and pemphigoid. Investigation included Tzanck smear, in which there were numerous lymphocytes, multinucleated giant cells, with intranuclear inclusion bodies. Differentiation of HZ and herpes simplex infection was confirmed by polymerase chain reaction (PCR). There was elevation in the levels of immunoglobulin (Ig)G and IgM antibodies against VZV. Varicella zoster virus IgM level was 23.9 μ/mL and VZV IgG level was greater than 155 μ/mL, which was suggestive of acute infection of HZ. Patient was treated with tablet valacyclovir thrice daily for 15 days and also tablet gabapentin once daily for 15 days, and 0.5% acyclovir cream topically for five times a day. The patient was reviewed after 15 days, showed healing of all the vesicles along with scaring, but persistence pain in the dermatome supplied by the affected nerve was suggestive of PHN (Figs 3 and 4). Patient was then advised to continue tablet gabapentin for another 15 days following which the pain subsided in a month. DISCUSSION Herpes zoster also named as zona or shingles is a common viral disease caused by the reactivation of VZV. Varicella zoster virus first enters the host and infects the cells of the 1,2 Reader, 3 Private Practitioner, 4,5 Lecturer