Abstract：
Becker\'s nevus is a main epidermal hypermelanotic condition that usually presents in adolescence, though childhood cases are seen less commonly. Congenital cases have been rarely reported. Nevus is usually unilateral having increased pigmentation and is characterized by hypertrichosis. It usually presents as a patch on back, proximal upper extremities, arms and upper trunk. Becker\'s Nevus presenting as bilateral asymmetrical patch is rare. A case of 23 year\'s old male with bilateral hyperpigmentad patch over the back has been reported. The histological exams established the clinical hypothesis of Becker\'s Nevus.
摘要：
贝克尔痣是一种主要的表皮黑色素沉着症，通常出现在青春期，虽然儿童期病例较少见。先天性病例很少报道。痣通常是单侧的，色素沉着增加，其特征是多毛症。它通常表现为背面的补丁，上肢近端,手臂和上躯干。贝克尔的痣表现为双侧不对称斑块是罕见的。报告一例23岁男性背部双侧色素沉着过度斑块。组织学检查建立了贝克尔痣的临床假设。
