A Case of Pigmented Bowen Disease on the Finger Mimicking Melanoma Showing a Chaos Pattern on Dermoscopy

摘要

A 53-year-old man presented with a 5-year history of a slowly increasing black macule on the palmar side of the ring finger (Figure 1A). Dermoscopic examination showed a “chaos” pattern composed of scaly surface, whitish clods, eccentric blackish brown structureless areas, parallel lines on both furrow and ridge, and peripheral segmental radial lines (Figure 1B). Total excision was performed, and histopathologic features were characteristic of Bowen disease (Figure 1, C and D).