What are the most common causes of actinomycosis?

See below: Actinomycosis is a slowly progressive bacterial infection most commonly caused by actinomyces israelii. These bacteria normally colonize the mouth, colon, and vagina and disruption of mucosa may lead to infection. Most common location is around the jaw followed by the lungs.

Actinomycosis is caused when bacteria called Actinomyces Israelii enters facial tissue after infection, surgery or trauma. Per Medlineplus.gov some have been caused by oral surgery, dental abscesses or have even been triggered by intrauterine devices.