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.
Keywords: dermatopathology; melanocytic nevi.
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