Breast abscess

Also called Breast infection

A breast abscess is a painful, pus-filled lump in the breast caused by a bacterial infection. It most often develops from mastitis in people who are breastfeeding, but it can also happen at other times, for example in smokers or after nipple piercing.

Last updated Nov 9, 2026

What it is

It is usually treated by draining the pus with a needle or a small cut, along with antibiotics.

If you are breastfeeding, you can usually carry on, which helps the breast drain. Feeding from the other side is an option while the affected breast heals.

Common signs

  • A painful, swollen, hot lump in the breast
  • Red skin over the lump
  • Fever and feeling unwell
  • Discharge from the nipple

How it is usually diagnosed

  • Examination
  • Breast ultrasound
  • A sample of the pus to find the bacteria

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Ultrasound reports
  • Culture results
  • Notes of each drainage and the antibiotics used

Questions to ask your doctor

  • Can I keep breastfeeding?
  • Will it need draining again?
  • Do I need a follow-up scan once it has healed?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • High fever, shivering or feeling very unwell with a red, painful breast

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

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