The palate and maxillary ridge of a 56-year-old woman contain multiple flat ulcers of 8 weeks' duration. She has a positive Nikolsky sign and has no evidence of skin or lip lesions. Which of the following should receive serious consideration in the clinical differential diagnosis?

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Pemphigus vulgaris is a chronic autoimmune blistering disease that affects the skin and mucous membranes. It is characterized by the formation of blisters that can rupture and form erosions. The Nikolsky sign is a positive sign in pemphigus vulgaris, which indicates that the skin is easily detached from the underlying tissue.

The Palate and Maxillary Ridge of a 56-Year-Old Woman Contain