Breast cancer metastases in the skin can have different clinical presentations, breast carcinoma in armor has an exceptional presentation. It is called "cuirasse carcinoma" because of its resemblance to the armor of cavalry soldiers, it is characterized by the presence of erythematous plaques of fibrous consistency that can become ulcerated, on the skin of the thorax. It usually appears between 60 and 80 years of age, as a first sign or as part of metastasis. When associated with metastasis, it is associated with a history of chemotherapy, radiotherapy or mastectomy. Treatment can be given with electro-chemotherapy, photodynamic therapy, intra-lesional therapy, hormonal therapy and local therapy with the aim of palliating the disease.