A stepwise approach to the diagnosis of blisters in the clinic1 1Abbreviations used in this text: BP, bullous pemphigoid; DH, dermatitis herpetiformis; EB, epidermolysis bullosa; EBA, epidermolysis bullosa acquisita; EREF, endogenous reaction to environmental factor; IMF, immunofluorescence; LAD, linear IgA disease; MMP, mucous membrane pemphigoid (formerly known as cicatricial pemphigoid); PCT, porphyria cutanea tarda; PF, pemphigus foliaceous; PG, pemphigoid gestationis; PV, pemphigus vulgaris; SLE, systemic lupus erythematosus; TEN, toxic epidermal necrolysis.