Erysipelas is a non-necrotizing acute dermal hypodermatitis most often of streptococcal origin. It most often affects the lower limbs. Erysipelas on surgical scar has been rarely reported in the literature. Few cases have been published since the first descriptions of this pathological entity by Baddour et al in 1982. We report the case of a 47-year-old patient. Operated for right breast mucinous carcinoma, she had neo-adjuvant chemotherapy followed by a surgical treatment (Patey) which occured without incident. The evolution was marked by the appearance after 11 months of the intervention of an Erysipelas on Patey scar. The patient was put on cefazol for 7 days intravenously injectable. The evolution was marked by the complete disappearance of the rash and the edema.