A breast abscess is a localised collection of pus within the breast tissue, forming when a breast infection (mastitis) is not adequately treated or fails to respond to antibiotics alone. It is one of the more painful breast conditions patients present with and, when diagnosed promptly, is very effectively treated with a straightforward drainage procedure.

At Breast & Surgical Oncology at The Poche Centre, breast abscesses are managed by our specialist breast surgical team. We offer ultrasound-guided needle aspiration as the preferred first-line treatment for most abscesses, and surgical drainage where needed, ensuring every patient receives the most appropriate and least invasive management for their situation.

How Does a Breast Abscess Form?

A breast abscess develops when bacteria infect breast tissue and the body's inflammatory response produces a walled-off cavity filled with pus. The most common pathway is progression from mastitis — infection of the breast tissue — that has not been fully cleared by antibiotics. Rather than resolving, the infected area becomes organised into a discrete collection.

The most commonly implicated bacterium is Staphylococcus aureus, though other organisms including streptococcal species are also found. Methicillin-resistant Staphylococcus aureus (MRSA) is increasingly recognised and is important to identify through culture to guide antibiotic selection.

Types of Breast Abscess

Lactational breast abscess develops in breastfeeding women, most commonly in the first three months after birth. It typically follows a period of mastitis that has been incompletely treated or has not responded to antibiotics. It is the most common type of breast abscess overall.

Non-lactational (periareolar) abscess occurs in women who are not breastfeeding, most commonly in the subareolar region beneath the nipple-areola complex. It is strongly associated with cigarette smoking and is related to periductal mastitis — chronic inflammation of the ducts beneath the nipple. Non-lactational abscesses tend to recur more frequently than lactational abscesses and may ultimately require surgical duct excision to achieve lasting resolution.

Peripheral breast abscess is less common and occurs in the breast tissue away from the subareolar area. It may be associated with diabetes, immunosuppression, or other systemic conditions, and can also result from infection of a sebaceous cyst or skin follicle overlying the breast.

Symptoms

The characteristic presentation of a breast abscess is a painful, tender, red, warm swelling in the breast that has a fluctuant quality — a soft, fluid-filled feel — in the centre of the inflamed area. Systemic symptoms including fever, chills, and general malaise are common when infection is active. In breastfeeding women, the affected breast is often engorged and feed delivery from that side may be difficult or painful.

It is important to note that not every breast lump with surrounding redness is an abscess. Early mastitis without abscess formation, inflammatory breast cancer, and other conditions can present similarly. Ultrasound is the most reliable way to confirm whether a fluid collection is present and to guide treatment decisions.

Diagnosis

Ultrasound is the investigation of choice for suspected breast abscess. It confirms the presence of a fluid collection, characterises its size and location, identifies whether it is a single cavity or multiloculated (multiple compartments), and guides drainage if needed. Ultrasound is quick, painless, and performed in the radiology department or, in some cases, by our surgeons with bedside ultrasound.

Pus culture — when drainage is performed, a sample of pus is sent for microbiological analysis to identify the causative organism and confirm antibiotic sensitivities. This is particularly important in recurrent or treatment-resistant cases and when MRSA is a concern.

Mammography is not routinely required for a straightforward abscess but may be performed in women over 40 where the presentation is atypical or to exclude an underlying breast lesion once the acute infection has resolved.

Treatment

Antibiotics

Antibiotics targeting Staphylococcus aureus are prescribed for all patients with a breast abscess, alongside drainage. They treat the surrounding soft tissue infection (cellulitis) that is almost always present around the abscess cavity, and reduce the risk of recurrence. Antibiotics alone are not sufficient to treat an established abscess — the pus collection must be drained.

Ultrasound-Guided Needle Aspiration

Ultrasound-guided needle aspiration is the preferred first-line treatment for most breast abscesses and is performed as an outpatient procedure under local anaesthetic. Under real-time ultrasound guidance, a needle is inserted into the abscess cavity and the pus is aspirated (drawn out). This typically provides immediate relief of pain and pressure.

Aspiration is repeated at intervals of two to three days if the collection re-accumulates, until the cavity is fully drained and the surrounding inflammation has settled. Most abscesses resolve with one to three aspiration sessions combined with antibiotics. This approach avoids the need for surgical incision and drainage in the majority of patients, preserves the breast cosmesis, and is associated with faster healing.

Surgical Incision and Drainage

When an abscess is very large, when the cavity is multiloculated (divided into multiple compartments that cannot be fully drained by needle alone), or when repeated needle aspiration has not achieved adequate resolution, surgical incision and drainage is required.

The procedure is performed under general or local anaesthetic. A small incision is made over the most fluctuant point of the abscess, the pus is drained, the cavity is irrigated, and the wound is packed lightly with gauze to allow it to heal from the inside out (by secondary intention). Regular dressing changes are required during healing, which typically takes one to three weeks depending on the size of the abscess.

A small scar is left at the incision site. Wound healing is generally very satisfactory and the scar fades over time.

Breastfeeding and Breast Abscess

Breastfeeding can and should continue during treatment of a breast abscess where possible. Continued feeding or expressing from the affected breast prevents milk stasis, which would otherwise worsen the infection. Breastfeeding is safe for the baby during antibiotic treatment with the agents commonly used for breast abscess. Your breast care nurse can provide specific guidance on feeding management during treatment.

Recurrent Breast Abscess

Recurrence is more common with non-lactational periareolar abscesses than with lactational abscesses, and is strongly associated with cigarette smoking. Women who have two or more episodes of periareolar abscess, or who develop a mammary duct fistula — a persistent opening between the duct system and the skin surface — are often best served by surgical duct excision (total duct excision) to remove the source of the recurring infection and achieve lasting resolution.

Smoking cessation is strongly recommended for all patients with recurrent non-lactational breast abscess, as it directly reduces the risk of further episodes by addressing the underlying ductal damage that predisposes to infection.

Excluding Inflammatory Breast Cancer

Any breast redness and swelling that does not improve promptly with appropriate antibiotics and drainage must be assessed to exclude inflammatory breast cancer, a rare but aggressive form of breast cancer that can closely mimic the appearance of breast infection. If a breast abscess does not respond to treatment as expected, or if the clinical picture is atypical, further investigation including imaging and biopsy will be arranged.

Booking an Appointment

If you have a suspected breast abscess or a breast infection that is not responding to antibiotics from your GP, prompt specialist assessment is appropriate. We offer urgent appointments and ultrasound-guided drainage for patients who need timely management.

This page is intended as a general guide only and does not replace personalised medical advice. If you have signs of a breast infection or abscess, please see your GP or contact our rooms for prompt specialist assessment.