Lactation is the most common risk factor for developing a breast abscess because the process of milk production can lead to milk stasis and ductal obstruction. These conditions facilitate bacterial invasion, most commonly by *Staphylococcus aureus*, resulting in infection and abscess formation. Additionally, cracks or fissures in the nipple during breastfeeding provide a portal of entry for pathogens. Early identification and management of lactational breast abscesses are crucial to prevent complications and preserve breastfeeding. Surgical intervention often involves incision and drainage when conservative treatment fails.

Reference: Bailey & Love's Short Practice of Surgery, Norman S. Williams, et al., 27th Edition.