I would assume that you have been diagnosed with a hole in your septum (septal perforation). The septum is the internal partition of the nose, made of cartilage and bone, that separates the right and left nasal passages. Perforations can be caused by infection, autoimmune disease, neoplasm, and trauma. Trauma can be from previous nasal fracture, rhinoplasty, or cauterization for nosebleeds. It is very possible, perhaps likely, that your "hole" is from previous surgery if none of the other conditions apply. However, it is hard to be certain. Perforations of the septum should be treated when they are symptomatic and cause bleeding, pain, crusting or nasal obstruction. Some perforations cause no symptoms at all. Best Wishes.