<prompt> Flaccid bullae with mucosal involvement and intraepidermal acantholysis are characteristic ofPemphygus vulgarisPemphigus foliaceousPsoriasisVitiligo  <response>: In pemphigus vulgaris skin involvement stas in the form of flaccid blisters. Cutaneous lesions are usually preceded by blisters and erosions of oral mucosa.HP shows a suprabasal cleft with bulla formation just above the basal layer with a tomb stone appearance and with blister cavity containing acantholytic cells and inflammatory cells.Page no 280,282. Reference IADVLs concise textbook of dermatology 