A 64-year-old otherwise healthy woman presents with a solitary, well-defined, slightly scaly, erythematous plaque on her lower back. The patient notes that the plaque has been slowly enlarging over the past year.
The most likely diagnosis is
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Psoriasis
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Bowen disease (squamous cell carcinoma in situ)
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Nummular eczema
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Extramammary Paget disease
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Superficial basal cell carcinoma
Answer on page 1151
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