Paraneoplastic acrokeratosis is a specific sign of cancer of the upper airway and upper digestive tract. The distinctive cutaneous changes include erythematous to plum-colored scaly acral lesions, paronychia, nail dysplasia, and keratoderma.
Witkowski JA, Parish LC. Bazex's Syndrome: Paraneoplastic Acrokeratosis. JAMA. 1982;248(21):2883–2884. doi:10.1001/jama.1982.03330210065038
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