Chronic autoimmune blistering disease
Blisters occur deep, within the epidermal basement membrane
Bullae evolve over weeks to months
Age > 60
Female
Malignancy
Furosemide
Bullous pemphigoid
Febrile
Toxic epidermal necrolysis
Diffuse distribution
Pemphigus vulgaris
Varicella
Dermatitis herpetiformis
Smallpox