Dermoscopic Features of Subcorneal Hematoma on the Palms and Soles: Differences from Acral Melanoma.

Background: The diagnosis of subcorneal hematoma (SH) can be challenging because the clinical presentation of SH can resemble melanocytic lesions. Few studies have examined the characteristic dermoscopic features of SH, but a more detailed large-scale study is needed to overcome the diagnostic challenge of differentiating it from acral melanoma.
Objectives: To describe the dermoscopic features of SH.
Methods: We evaluated the clinical and dermoscopic features of 50 SH lesions from 43 patients at the Pusan National University Hospitals (Busan and Yangsan).
Results: In the color analysis, 86% of cases showed the bruise color sign; 7 cases had a single color (red to purple: 2; black: 1; brown: 4). Typical dermoscopic features of SH, acral nevi, and acral melanoma-associated patterns were observed in 60%, 0%, and 72% of lesions, respectively. Hematoma-associated patterns were homogenously red-to-black with or without satellite globules (32%) and pebbles on the ridges (28%). Acral melanoma-associated patterns showed a parallel ridge pattern (PRP) (52%), irregular dots and globules (50%), polychromia (34%), asymmetry (24%), irregular blotches (10%), and ulcers (10%). No case showed blue-white veils, regression structures, atypical vascular patterns, or irregular fibrillar patterns. The bruise color sign was positive in most cases, with acral melanoma-associated patterns (88.9%).