<prompt> A 40-year male presenting with painful flaccid vesicles on the face and oral mucosa with asymmetric distribution. Immunofluorescence shows intercellular IgG deposition in the epidermis. Diagnosis isErythema multifomiisBullous pemphigoidPemphigus vulgarisHerpes zoster  <response>: In this patient go stepwiseNo itchingPain present only two differentials, i.e. pemphigus and herpes zosterFlaccid vesicles on faceMucosal involvementAsymmetric distributionIntercellular IgG in the epidermisDiagnosis is pemphigus vulgaris 