Blue nevus is a type of melanocytic nevus. The blue colour is caused by the pigment being deeper in the skin than in ordinary nevi. In principle they are harmless but they can sometimes be mimicked by malignant lesions, i.e. some melanomas can look like a blue nevus.
Blue nevus 是指由于黑色素细胞过度增生而形成的一类皮肤病变，常表现为在头部、手臂或臀部出现蓝色至黑色的斑块。它们大多为单发且后天获得，但也可能是先天性，呈多发分布。此类病变常被误认为是黑色素瘤等深色素肿瘤，常见于头皮、手臂、下背部或臀部，呈蓝色。 The term blue nevus describes a group of skin lesions characterized by dermal proliferation of melanocytes presenting as blue to black nodules on the head, extremities, or buttocks. In most cases, they are acquired and present as a solitary lesion but may also be congenital and appear at multiple sites. Blue nevi are melanotic dermal lesions that commonly presents as a blue nodule on the scalp, extremities, sacrococcygeal region, or buttocks. Its characteristic blue to black hue is frequently confused with other darker pigmented lesions, including malignant melanoma.
有时需要进行活检，或通过手术切除整个病变。临床预后一般良好，恶性转化的可能性很小。鉴别诊断包括皮肤纤维瘤和黑色素瘤。