When mastitis occurs during breastfeeding, if the inflammation is not serious, it can be treated by emptying the milk, but if the inflammation is serious, then antibiotics will be needed to treat it, and surgery may even be required to drain the pus. When a woman is breastfeeding, if the milk is not drained in a timely manner and the tissues are stagnant for a long time, it may cause mastitis, resulting in localized redness, swelling and pain in the breast and even fever. If the infection is not serious, it is not necessary to use antibiotics, but to ask a lactation specialist to empty the milk. If the blood work suggests a significant infection, then antibiotics will be needed for anti-inflammatory treatment, and cefdinir can be taken if you are not allergic to cephalexin. If there is septicemia in the breast, antibiotic treatment alone is not effective and a surgical incision to drain the septicemia must be performed in breast surgery to completely cure the mastitis. If the use of antibiotics does not affect the baby, the other side can breastfeed normally.