Infections related to dermal fillers are very rare. Infection is always a risk when a needle is injected into the skin, even with the best sterile technique. Infection may occur immediately or a few weeks after the injection. The incidence of complications with hyaluronic dermal fillers has been incredibly low, however, newer fillers have been introduced that have a higher risk profile.
Every time a needle enters the body, there is a small risk of infection despite proper aseptic technique. In the rare occurrence of an infection, it is usually a superficial type cellulitis that affects the soft tissues and skin near the injection site. These are fairly easy to treat with an oral antibiotic. Abscess formation and spread of infection may occur, but they are much less frequent.
Infected skin biofilm may also appear.