Pemphigus vulgaris (PV) is an autoimmune blistering disease affecting the skin and mucosa. It clinically presents as painful erosions, mainly in oral cavity, flaccid blisters erosions on skin. Steven-johnson syndrome/toxic epidermal necrolysis (SJS/TEN) a severe mucocutaneous drug hypersensitivity reaction characterized by painful, dusky, erythematous eruptions that often progress to blisters, ...