Biofilm in dermal fillers: what it is and why it matters

Biofilm is a community of microorganisms, usually bacteria, that attaches to a surface and wraps itself in a matrix it produces. This matrix shields the bacteria from the immune system and makes antibiotics less effective, which makes the infection more persistent than an ordinary one.

In orofacial harmonization, the injected material can serve as a surface for this attachment. Bacteria from the skin, the oral mucosa or the environment can reach the product at the time of injection or, later, through the bloodstream, and organize themselves there.

How does biofilm show up in practice?

The typical picture is late-onset: weeks or months after the procedure, hardened nodules, redness, intermittent swelling or pain appear in the treated area. Conventional cultures often come back negative, precisely because the bacteria are protected within the matrix. That is why biofilm belongs in the differential diagnosis of inflammatory nodules and late reactions.

With hyaluronic acid, management may involve hyaluronidase to break down the gel that serves as support, combined with antibiotics, depending on the assessment. With non-degradable fillers, treatment tends to be harder.

Which precautions reduce the risk?

• Proper skin antisepsis and makeup removal before injection.
• Clean technique and single-use materials.
• Avoiding injection over areas with active infection, such as herpes lesions or inflamed acne.
• Checking for recent or planned dental procedures, at the professional's discretion.

The topic is covered in safety and complications.

Also called: bacterial biofilm.