Idiopathic granulomatous mastitis: what should you know?

Idiopathic granulomatous mastitis causes inflammation within breast tissue. A firm area, tenderness, redness, swelling, skin thickening, an abscess, or a draining opening may occur. It can resemble infection or breast cancer on examination and imaging, so the appearance alone cannot establish the diagnosis.

The word idiopathic means that no single cause has been identified. A clinician may ask about recent pregnancy, breastfeeding, medicines, infection symptoms, and previous breast problems. Imaging and a tissue sample may be needed to confirm inflammation and rule out other conditions.

Arrange assessment for a new breast lump, persistent pain, redness, or drainage. Keep any affected skin clean and dry, avoid squeezing the area, and use supportive clothing if it reduces movement-related discomfort. If breastfeeding is painful, a lactation consultation can help review positioning, milk removal, and nipple or breast trauma.

Treatment depends on the examination, biopsy findings, severity, and whether infection or another cause is present. Options may include observation, medicines that reduce inflammation, drainage, or surgery. Do not start antibiotics, steroids, or supplements without clinical advice.

Seek prompt medical care for fever, rapidly spreading redness, increasing swelling, severe pain, feeling faint, or pus-like drainage. Urgent assessment is also needed for a new skin indentation, nipple inversion, bloody discharge, or a lump that persists. These signs do not identify the cause, but they should not be ignored.

What other conditions need to be ruled out? Do I need imaging or a biopsy? Is breastfeeding safe or comfortable for me right now? Which treatment option fits the inflammation and any abscess, and how will we monitor change?