Some women may also experience relentless chills, and leukocytosis (raised white blood cell count). Essentially, it is an inflammatory reaction to an infection, which can cause these symptoms, build-ups of fluid (edema warmth, tenderness and pain, swelling, rash, and redness (erythema) to the breast. You will want to read about inflammatory breast cancer, and look at the pictures, AND, you need some patience to give antibiotics a chance to work.
New England Journal of Medicine, (February 2004) Volume 350:9. Baddour,., Breast cellulitis complicating breast conservation therapy.