Widespread Pruritic Vesicles and Bullae

A 4-year-old, previously healthy girl presented with large, tense bullae involving up to 40% of her body surface area. Her parents described a 12-day history of itchy, papulovesicular lesions that had progressed into large blisters. Your dx?

A 4-year-old, previously healthy girl presented with large, tense bullae involving up to 40% of her body surface area. Her parents described a 12-day history of itchy, papulovesicular lesions that had progressed into large blisters.

Your dx?