Foreign bodies of the nose are mostly common in paediatric population. In teenagers and adults, they are predominately seen in patients with mental disturbances. Usually with acute presentation, they also can remain in place for a long time. The main clinical presentation is unilateral purulent rhinorrhea possibly associated, in chronic cases, to nasal deformities, nasomaxillary abnormalities or rhinolithes. The removal can require a surgical procedure under general anaesthesia specifically in front of neglected foreign bodies covered by mucosa or previous multiple failed attempts. We report the case of a 14-years-old girl, with mental retardation, who consulted in our structure for a swelling in the left nasal alar base evolving progressively since 4 months, with intermittent purulent rhinorrhea not improved after medical treatment. No incident of nasal foreign body insertion was reported or witnessed by the patient and its family. The facial CT scan confirmed the diagnosis and the removal required surgical procedure. The diagnosis of neglected nasal foreign body should always be considered in front of unilateral nasal obstruction and discharge specifically in children and mentally disabled patients. Its removal should be rapid in order to avoid the constitution of rhinolithes and nasal deformities.