What histologic finding distinguishes superficial pemphigus and bullous impetigo?
D003937:Diagnosis, Differential; D005455:Fluorescent Antibody Technique; D006801:Humans; D007169:Impetigo / Q000473:pathology*; D010392:Pemphigus / Q000473:pathology*; D012872:Skin Diseases, Vesiculobullous / Q000175:diagnosis