A patient comes to u with an ill defined, irregularly shaped gingival erosions which are painful and are of short duration, a few months later skin lesions were also noticed, on histopathological examination Tzanck cells were found, probable diagnosis is:

Oral manifestations: Oral lesions common and precede skin lesions by months Intact bullae are rare; patients usually present with ill-defined, irregularly shaped, gingival, buccal, palatal erosions, which are painful and slow to heal Erosions extend peripherally with shedding of the epithelium.