A 71-tear-old woman presents to the emergency department for evaluation of a blistering,intensely pruritic generalized rash that started 5 days earlier.Multiple ruptured and intact hemorrhagic bullae are obvious on the hands,arm,neck,chest,back,and abdomen and to a lesser exent on the lower extremities.The mucous membranes are spared.The Nikolsky sign is absent.The patient reports recent use of furosemide for periodic leg swelling.
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