A 48-year-old healthy Asian man presents with a 4-year history of a circumscribed pruritic plaque on the dorsal aspect of his right thumb. The plaque is thickened, with exaggeration of the normal skin markings.
The most likely diagnosis is
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Lichen simplex chronicus
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Dyshidrotic eczema (pompholyx)
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Psoriasis
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Tinea manuum
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Granuloma annulare
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