<prompt> Which of the following is a subepidermal vesiculobuilous disorder-Pemphigus vulgarisBullous pemphigoidPemphigus vegetansPemphigus erythematosus  <response>: Ans. is b i.e., Bullous pemphigoid 1 Immunohuilous disorders due to autoimmunity also called primary blistering diseaseA IntraepidermalB Subepidermalo Pemphiguso Bullous pemphigoid Pemphigus vulgariso Dermatitis herpatiformis Pemphigus foliaceouso Epidermolysis bullosa acquisita Pemphigus vegetans Pemphigus erythematosus 2 Mechanobullous disorders due to defect in structure and organization of epidermis or dermoepidermal junctiono Epidermolysis bullosao Bullous ichthyosiform erythroderma3.Other disorders1. Infections - VZV, HSV, Bullous impetigo. Staphylococcus scalded skin syndrome2. Metabolic - Porphyria. Diabetes. Hemodialysis3. Drug eruptions - Fixed drug eruption, Stevens-johnson syndrome, Erythema multiforme. 