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© 2015 The Authors. doi: 10.2340/00015555-1865 Journal Compilation © 2015 Acta Dermato-Venereologica. ISSN 0001-5555 Dermoscopy has contributed to differential diagnosis of malignant melanoma from melanocytic naevus on acral volar skin. Most acquired melanocytic naevi show a parallel linear pigmentation corresponding to the furrow of the surface skin marking (a parallel furrow pattern [PFP]). In contrast, a parallel ridge pattern (PRP), defined as a band-like pigmentation on the ridge of the surface skin marking, is highly specific for malignant melanoma (1). Only 1% of acral melanocytic naevus was reported to present the PRP (2). Here, we report a case of acral melanocytic naevus showing the PRP, in which melanin deposition was predominantly distributed under the surface ridge.

Melanocytic Naevus Shows Parallel Ridge Pattern due to the Melanin Columns Under the Ridges