On the 3rd day after giving birth a 29year old postparturient woman developed diffuse edema of the right mammary gland with pain on palpation hypermic skin in the affected area and elevated body temperature upto 38c. Histology of the gland tissue revealed a diffuse celluar infiltration in stroma, which consisted of a large amount of neutrophilic leukocytes, interestial edema and vascular hypermia. Make the diagnostic.