Septum is the most important anatomical and functional structure of nose. Thus, any kind of damage to septum can cause serious structural deformity of nose. Although nasal trauma at childhood hood is seen frequently, septal heamatoma and abscess formation is very rare. Septal heamatoma and abscess cause serious nasal and systemic complications in children. We presented a 6 years-old boy with the complaining of difficulty in nasal breathing and diagnosed as septal abscess five days after a nasal trauma.