Rule out life-threatening etiology
Evaluate for nephropathy
Fever
Toxic appearance
Hypotension
Mucosal lesions
Severe pain
Very old or young age
Immunosuppressed
New medication
Bullosis diabeticorum
Febrile
Lichen sclerosus
Diffuse distribution
Phytophotodermatitis
Varicella
Tinea corporis
Smallpox