Question category: Dermatology
A 72 year old female presents to her GP after noticing blisters on her arms and legs. She has recently been commenced on furosemide. On examination there is tense blisters evident predominantly on the flexural surfaces of her arms and legs. There is no evidence of blisters in her mucous membranes. There is some healing areas where the blisters have burst but no evidence of scarring. A skin biopsy is organised and reveals subepidermal blister and inflammatory infiltrate with numerous eosinophils. What is the most likely diagnosis?