<prompt> A 50-year-old male known case of myasthenia with erythema shallow erosions with few blisters and scales. Oral mucosa is not involved immunopathology demonstrates IgG deposition on keratinocytes and autoantibodies against Dsg 1. The diagnosis isPemphigus vulgarisBullous pemphigoidPemphigus foliaceousDermatitis herpetiformis  <response>: In this question :-Association with mysthenia gravisShallow erosions with few blistersNo involvement of oral mucosaIgG against desmoglein 1 All suggests pemphigous foliaceous :-All suggests pemphigous foliaceous:-i P. foliaceous is the most common variant of pemphigus which is associated with paraneoplastic pemphigus eg. thymoma with mysthenia gravis 