Serial sections show focal subcorneal clefting of epidermis with associated moderate dermal perivascular inflammatory infiltrate formed of lymphocytes, plasma cells and eosinophils. No evidence of specific granulomas. Picture consistent with pemphigus foliaceous.
Generalized plaque with ulceration.
Four skin ellipses collectively measured 1x0.7x0.3 cm, totally embedded.
Skin biopsies: