An acute breast abscess has ruptured, and it should be treated in a formal hospital setting. Under general anesthesia through intravenous administration, the abscess area should be expanded to the normal tissue via an incision. Then, using color ultrasound for abscess localization, to avoid damaging the milk ducts and prevent fistula formation, the incision should follow the direction of the milk ducts, extending radially towards the areola. If there are multiple abscess cavities, the partitions between the cavities should be opened with a finger. If necessary, multiple incisions should be made, or successive operations for drainage of the abscess cavities might be required. Latex sheets or drainage tubes may be used.