Halo nevus - 晕痣
References
一名7岁女孩的额头上有一个黑色胎记，在过去的三个月里，胎记周围出现了一圈白色的环。
A 7-year-old girl presented with a blackish birthmark on her forehead, which had gotten a white ring around it over the past three months.
A 7-year-old girl presented with a blackish birthmark on her forehead, which had gotten a white ring around it over the past three months.
尽管 晕痣 (halo nevus) 在大多数情况下是无害的，但定期监测病变很重要。如果病变外观有任何变化或伴有疼痛，应立即咨询医生以排除黑色素瘤的可能性。
据估计， 晕痣 (halo nevus) 存在于大约 1% 的普通人群中，并且在白癜风、恶性黑色素瘤或特纳综合征患者中更为常见。平均发病年龄为青少年时期。