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

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