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The question
A 58-year-old man with chronic lymphocytic leukaemia has had severe, painful erosions of the lips, tongue and buccal mucosa for 2 months that have not responded to oral steroids, with bilateral conjunctivitis. His skin shows a mix of flaccid blisters, target-like lesions and lichenoid papules, including on the palms. Which test best supports the most likely diagnosis?
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