Abstract: Breast cancer results in the highest morbidity and mortality rates among women.Skin metastasis of breast cancer is uncommon in clinical settings，and is easily misdiagnosed.We reported a case with skin metastasis of breast cancer who was admitted to PLA 518 Hospital on 25 February 2019，with an experience of being misdiagnosed as sebaceous gland cyst accompanied by infection，and reviewed the related cases reported in other studies，then discussed the diverse and complex clinical manifestations as well as pathogenesis of skin metastasis of breast cancer，hoping to enrich clinicians’ knowledge of the disease to reduce the possibility of making a misdiagnosis or missed diagnosis and improve the possibility of making an accurate diagnosis based on clinical manifestations，or in combination with CT scan and pathological examination if necessary，by which proper treatment can be delivered as early as possible.

Key words: Breast cancer, Skin metastasis, Sebaceous cyst with infection, Pathogenesis, Diagnostic errors, Case reports, Diagnosis

摘要： 乳腺癌是女性发病率和死亡率最高的恶性肿瘤，乳腺癌皮肤转移在临床上并不常见，且容易造成误诊。本文报道了1例于2019-02-25入住中国人民解放军第518医院的乳腺癌皮肤转移患者的诊断经过以及被误诊为皮脂腺囊肿伴感染的文献分析。初步探讨了乳腺癌皮肤转移复杂多样的临床表现以及发病机制，以提高临床医生对乳腺癌皮肤转移的认识，当诊断困难时需结合电子计算机断层扫描（CT）、病理学检查辅助诊断，从而早发现、早治疗，以免造成误诊、漏诊。

关键词: 乳腺癌, 皮肤转移, 皮脂腺囊肿伴感染, 发病机制, 误诊, 病例报告, 诊断