iga pemphigus iga pemphigus iga pemphigus is a subtype of pemphigus with two distinct forms: subcorneal pustular dermatosis (also known as sneddon–wilkinson disease and pustulosis subcornealis) is skin condition that is a rare, chronic, recurrent, pustular eruption characterized histopathologically by subcorneal pustules that contain abundant neutrophils.: 203 this is distinct from and not to be confused with subcorneal pustular dermatosis type of iga pemphigus. sneddon's syndrome, also known as ehrmann-sneddon syndrome, is also a different syndrome. intraepidermal neutrophilic iga dermatosis is characterized histologically by intraepidermal bullae with neutrophils, some eosinophils, and acantholysis.: 465 iga pemphigusspecialtydermatology