Listeria monocytogenes infection usually presents with self-limited gastrointestinal symptoms, neurolisteriosis or bacteremia. Focal involvement is very rare. We describe a case of submandibular abscess, with a 3-week progressing history of submandibular pain and swelling, diagnosed concomitantly with type 2 diabetes mellitus. An empirical antibiotic treatment was started and drainage of the abscess was perform...