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Dermoscopic furrow ink test of the palmar lesion in loricrin keratoderma.
Journal of Dermatology 2022 April 26
Palmoplantar keratodermas (PPK) comprise a heterogeneous group of keratinization disorders that gradually progress during childhood, resulting in difficulties to establish a diagnosis and to identify a candidate gene for sequencing. Dermoscopic examination with staining of palmoplantar skin using a whiteboard marker, so-called "furrow ink test", could be a useful tool for differentiation between furrow and ridge in understanding the morphological characteristics of PPK. One of the striking features in autosomal dominant loricrin keratoderma (LK) is diffuse PPK with honeycomb pattern. In this study, we performed dermoscopic furrow ink test in a Japanese family of LK with the most frequent mutation c.684dup, p.Ser229Valfs*107 in the loricrin gene. The severe lesion revealed that irregular circular hyperkeratoses were aggregated and normal structures of furrows and ridges were disrupted. To accurately describe the nature of this dermoscopic patterned skin surface, we suggest that the condition could be termed as "irregular cobblestone appearance" rather than "honeycomb pattern". Regular cobblestone appearance to maintain parallel furrow structure was observed in early or mild hyperkeratotic lesions. Eccrine sweat glands that open on the surface of ridges nearly disappeared, resulting in hypohidrosis.
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