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1401 Skin

A 30 year old pregnant woman presents to a physician with painful oral ulcers. Physical examination demonstrates widespread erosions of her mucous membranes. Close examination reveals a friable mucosa, but no well-defined aphthous ulcers. Biopsy of perilesional mucosa demonstrates acantholysis; direct immunofluorescence demonstrates an intraepidermal band of IgG and C3. Which of the following is the most likely diagnosis?

ABullous pemphigoid
BDermatitis herpetiformis
CHerpes simplex I
DPemphigus vulgaris
Skin
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