What should you know about cystic granulomatous mastitis?

The inflammation can form firm areas or cyst-like spaces within breast tissue. The breast may feel tender, warm, or uneven, and the skin can become red or develop an opening that leaks fluid. Symptoms may affect one breast and can change over time. The appearance can overlap with bacterial mastitis, an abscess, or other breast conditions, so an examination and breast imaging may be needed. A clinician may recommend sampling tissue or fluid when the diagnosis is uncertain; this helps distinguish inflammation from infection and other causes.

Arrange an appointment with a breast specialist or another qualified clinician, especially if a lump, discharge, or skin change persists. Keep the area clean and avoid squeezing a lump or opening. Tell the clinician about recent pregnancy, breastfeeding, medicines, autoimmune symptoms, fever, and how the breast changes have developed. Treatment is tailored to the findings and may involve observation, anti-inflammatory treatment, antibiotics when infection is suspected, drainage, or a procedure. If breastfeeding is painful or difficult, a lactation consultation can help protect milk removal and comfort while the breast is assessed.

Seek prompt medical care for fever, rapidly increasing redness or swelling, worsening pain, pus-like drainage, a new wound, or feeling suddenly unwell. Seek urgent help if severe illness, faintness, confusion, or breathing difficulty occurs. A new breast lump or nipple change also deserves assessment, even when pain is present, because symptoms alone cannot identify the cause.

Ask what findings support cystic granulomatous mastitis, whether imaging or a biopsy is appropriate, how infection will be checked, what treatment choices fit your situation, and how to care for the breast during breastfeeding.