Acute mastitis is generally caused by the accumulation of milk or bacterial infection. Diet does not have a significant impact on acute mastitis, so a normal diet is usually sufficient for those suffering from it, but it should be light. In the early stages of inflammation in acute mastitis, breastfeeding can continue, mainly to maintain the flow of milk, which can help alleviate the condition. However, if there is a significant systemic reaction, antibiotics can be used for treatment, typically starting with penicillin. However, if an abscess has formed, further surgical incision and drainage may be necessary. (Note: This answer is for reference only. Medications should be administered under the guidance of a professional doctor, and self-medication should be avoided.)