<prompt> A patient presenting with tense bullae on erythematous base. On histopathological examination following can be seen?Subcorneal splitSub epidermal splitFishnet patternRaw of tomb stones appearance  <response>: Ans. is b i.e., Sub epidermal split Tense bullae on erythematous base on erythematous base are characteristic presentation of bullous pemphigoid. Bullous pemphigoid is a sub epidermal blistering disorder. Characteristic histopathological finding of BP is sub epidermal split with relatively normal epidermis and mixed inflammatory infiltrate consisting of numerous eosinophils, mononuclear cells and few neutrophills. 