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Focal palmoplantar keratoderma (PPK) with severe pain is a hallmark of pachyonychia congenita, a rare autosomal dominant disorder involving PPK and hypertrophic nail dystrophy. Some families present focal PPK with either minimal or no nail changes. Dominant‐negative mutations in any of the four identified keratin genes, KRT6A,KRT6B,KRT16 or KRT17, lead to pachyonychia congenita. However, the majority...
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