What Is Biofilm on Breast Implants?

A biofilm is a low-grade, subclinical infection — a collection of bacteria living somewhere in your body, usually on something that doesn't have a good blood supply or has no blood supply at all. The bacteria essentially hold hands, create a gooey protective coating, and hang out there. Over time, they cause inflammation in the normal tissue surrounding them.

A common everyday example? Plaque on your teeth is a biofilm.

Biofilms can form on breast implants and all sorts of other implanted devices. On breast implants specifically, the bacteria involved are almost always:

• Skin bacteria that were present at the time of surgery
• Bacteria from the ductal system within the breast that got on the implant during placement

These aren't aggressive bacteria that cause dramatic infections requiring ICU care. They're more subtle — which is exactly what makes biofilms tricky.

No. Many women with biofilms on their breast implants have zero symptoms. But for some women, biofilm does cause problems — and in particular, certain bacteria have been linked to capsular contracture:

• C. acnes (Cutibacterium acnes) — a common offender
• Staph epi (Staphylococcus epidermidis) — another common offender

Not every woman with these bacteria on her implant develops a contracture. There's still a lot we don't understand about who gets capsular contracture and who doesn't — but biofilm is clearly a contributing factor.

You'll often hear in the breast implant community that biofilm causes symptoms associated with breast implant illness (now called systemic symptoms from breast implants, or SSBI).

Here's what the data shows:

• Studies have been done, and the best current data shows no association between biofilm and systemic symptoms
• Further study is still needed
• It's always possible that individual patients don't do well with biofilms, and that was specifically their problem — but at a population level, the evidence doesn't support a link

The breast surgery community has gotten much better at preventing biofilms, which is a big reason capsular contracture rates have dropped so dramatically. Current prevention strategies include:

• Avoiding the nipple incision — which passes through bacteria-rich ductal tissue
• Using Keller funnels to place implants without directly touching them
• Specialty irrigant solutions to reduce bacterial contamination in the surgical pocket

The results are impressive: the most recent data from Allergan shows a capsular contracture rate of less than 2% — a huge improvement over historical rates of 10–15%.

Biofilms are common, often harmless, but can contribute to capsular contracture in certain patients. Modern surgical techniques focused on biofilm prevention have dramatically reduced contracture rates. If you're considering breast augmentation or are dealing with implant complications, understanding biofilm is an important part of the conversation with your surgeon.