HISTOPATHOLOGY: 4 histological patterns:
focal acantholytic dyskeratosis as in Darier disease
Hailey-Hailey disease pattern
pemphigus vulgaris or pemphigus foliaceus pattern
spongiotic dermatitis pattern
Any or all four patterns may be present. Nonspecific immunofluorescence pattern.
DIFFERENTIAL DIAGNOSIS:
Darier disease
Hailey-Hailey disease
pemphigus vulgaris or pemphigus foliaceus
spongiotic dermatitis