Condition	Characteristics
Bullae secondary to edema	Bullae on lower extremities with associated edema
Bullous pemphigoid	Tense vesicles and bullae
Pemphigus vulgaris	Flaccid, easily ruptured vesicles
Herpes zoster	Follows dermatome, small vesicles
Fixed drug reaction	Localized lesion or cluster reappears at same site on rechallenge