Comparison of dermoscopic features between congenital and acquired acral melanocytic nevi in Korean patients

摘要

Abstract Background The dermoscopic patterns of acral melanocytic nevi ( AMN s) are crucial in differentiating them from acral melanoma. Several studies have reported the dermoscopic patterns of acquired acral melanocytic nevi ( AAMN s). However, few have investigated the dermoscopic patterns of congenital acral melanocytic nevi ( CAMN s). Objective To compare the clinical and dermoscopic features of CAMNs and AAMNs. Methods The present study included 43 patients with CAMN s and 40 with AAMN s. We reviewed their medical records as well as their clinical and dermoscopic findings. Results Congenital acral melanocytic nevis were more asymmetrical than AAMN s ( P ?=?0.002) and presented more frequently as comma‐shaped ( P ?=?0.005). Regarding dermoscopic findings, globular pattern (55.8%) was the most common feature of CAMN s, while parallel furrow pattern (37.5%) was the most common feature of AAMN s. The presence of fibrillar, globular, and parallel ridge patterns, and diffuse multi‐component pigmentation differed significantly between the groups ( P ??0.05). Furthermore, CAMN s showed melanoma‐specific dermoscopic patterns, such as parallel ridge (18.6%) and diffuse multi‐component pigmentation (25.6%). Conclusion The dermoscopic patterns of CAMN s and AAMN s differed markedly. In terms of dermoscopic patterns, CAMN s resembled acral melanoma more often than AAMN s did.