The dermoscopic features of longitudinally aligned pigmentation on the hyponychium were previously described in pediatric patients with longitudinal melanonychia. We report four cases of biopsy-proven acral melanocytic nevi on the hyponychium with a longitudinal brush pigmentation (LBP) pattern in dermoscopy. This LBP pattern on the hyponychium may be a counterpart of the fibrillar pattern of acral melanocytic nevi. Therefore, the LBP pattern in dermoscopy may provide a useful clue for distinguishing benign melanocytic nevi from melanoma in pediatric patients.

中文翻译：

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具有皮肤镜特征的儿童纵向刷状色素沉着的下甲黑色素细胞痣

先前在患有纵向黑甲的儿童患者中描述了下甲上纵向排列的色素沉着的皮肤镜特征。我们报告了四例经活检证实的下甲上肢端黑色素细胞痣，皮肤镜检查呈纵向刷状色素沉着 (LBP) 模式。下甲上的这种 LBP 模式可能与肢端黑色素细胞痣的纤维状模式对应。因此，皮肤镜检查中的 LBP 模式可能为区分儿科患者的良性黑色素细胞痣和黑色素瘤提供有用的线索。