Placing objects in the mouth by children get accidentally implanted in the oral cavity, ingested, or aspirated. The incidence of foreign bodies is usually higher in the zone of head and neck than other regions of the human body. Usually, foreign bodies are symptomatic and signs of inflammation pain and purulent discharge are shown. This paper describes an unusual case of traumatic foreign body (pen cover) accidently moved in the retromolar area causing recurrent facial swelling, purulent discharge, and reduced mouth opening.