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We report the case of a 65-year-old woman who underwent breast-conserving surgery (BCS) and radiotherapy for breast cancer with hyperpigmentation and skin thickening of the treated breast site 10 years after the surgery. The patient was injected with a liquid foreign body in both breasts 30 years ago. Theses clinical features were considered scleroderma, post-irradiation morphea (PIM), and recurrent breast cancer for differential diagnosis. We performed breast magnetic resonance imaging (MRI), however, the patient had no abnormal findings. Owing to the pain, increased hyperpigmentation, and possibility of cancer recurrence, the patient underwent a simple mastectomy. The final pathologic diagnosis was oleoma with post-radiation fibrosis among drug-induced and toxic scleroderma-like disorders. The patient tolerated surgical therapy without complications. This case report highlight is that difficult to …