The bone and cartilage that divide the inside of the nose is the septum. A deviated septum occurs when the nasal septum is off center, leaving the size of the nasal passageways unequal.
Though a deviated septum can develop in anyone, injury or trauma to the nose are common triggers. Often, a deviated septum will result in difficulty breathing through the nose, sinus infections and nosebleeds, says the American Academy of Otolaryngology.
If symptoms are severe enough, your doctor may suggest surgery. Septoplasty is a surgical procedure performed through the nostrils, and typically results in no bruising or outward sign of surgery.