“…In most biopsy material a perivascular infiltrate is seen consisting predominantly of neutrophils and rarely histiocytes and eosinophils. Ultrastructural examination shows no acantholysis (Metz & Schropl, 1970). No investigator has yet demonstrated either direct or indirect immunofluorescence similar to that which occurs in pemphigus (Johnson & Cripps, t974;Chorzelski et al, 1966;Bean et al, 1971).…”