The patient was a 78-year-old woman who prevented with a mass in the right upper arm for 70 years, accompanied with erythema and itching for 3 months. Histopathological examination of the skin lesion showed mild hyperkeratosis, acanthosis, extension of skin protrusion, and intradermal nevus cells and nevus cell nest, part of which was ground-glass-like and some showed active proliferation, with inflammatory cell infiltration that was dominated by lots of lymphocytes and eosinophils. In addition, there was mature phenom￣enon, peripheral angiogenesis as well as inflammatory cell infiltration. The diagnosis of Meyerson nevus was made.%患者,女,78岁。右上臂肿块70年,伴红斑瘙痒3个月,皮损组织病理示：轻度角化过度,棘层肥厚,皮突延长,真皮内痣细胞和痣细胞巢,部分呈毛玻璃样,部分增生活跃,有较多淋巴细胞和嗜酸粒细胞为主的炎细胞浸润,有成熟现象,外围血管增生和炎性细胞浸润。诊断：Meyerson痣。
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