Granulomatous Mastitis

What it is

Granulomatous mastitis is a benign, or non-harmful, inflammatory condition. It happens when your immune system's cells form clumps inside your breast tissue, which can cause a firm mass. It is not an infection and is not contagious.

How common it is

This condition is rare. It most often affects women during their childbearing years and can sometimes appear a few months or even years after pregnancy.

What you may notice

You might feel a firm, tender lump or notice swelling and redness. Sometimes the skin can look thick or dimpled, or an open sore may form that drains fluid.

What can contribute

The exact cause is not known. It may be related to an over-response from your body's immune system or to hormonal changes.

How it is usually checked

Your provider will likely start with a physical exam and imaging, like a mammogram or ultrasound. Because it can look like other conditions, a biopsy, where a small tissue sample is taken for study, is often needed to confirm the diagnosis.

Does this change my long-term risk?

Granulomatous mastitis does not change your long-term breast health risk. Your provider will want to do careful testing to get the right diagnosis, because it can look similar to more serious conditions.

Comfort and everyday care

• Applying a warm compress to the area may help soothe discomfort.
• Wearing a soft, supportive bra without an underwire can reduce pressure and pain.
• Some women find that eating a balanced diet and managing stress helps support their overall well-being during healing.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.