Blue nevus - 蓝痣
因为痣细胞存在较深，所以呈现蓝色。
References
Blue nevus 是指由于黑色素细胞过度生长而引起的一组皮肤增生，在头部、手臂或臀部出现蓝色到黑色的肿块。它们通常是单一的和后天获得的，但也可能从出生时就存在并出现在多个区域。这些病变经常被误认为是黑色素瘤等深色色素生长，通常在头皮、手臂、下背部或臀部呈现蓝色。
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.
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.
有时会进行活检，或通过手术切除整个病变。临床结果一般良好，癌变的机会很小。鉴别诊断包括皮肤纤维瘤和黑色素瘤。