I am a Board Certified Plastic Surgeon. Nasal obstruction can be from many reasons, most of them impossible to determine over the Internet. An examination and evaluation would be the best way to go. Allergies can obstruct the nose. Surgery can not improve the reaction of allergies.
Surgery can improve mechanical obstruction.
Sometimes a slight allergic reaction can close off a partial obstruction. Septal perforations can sometimes change the pattern of airflow in the nose enough to cause crusting and then obstruct the airway. Other materials can irritate the lining of nose aggravating the problem. Placing materials in the nose can cause septal perforations. Although we sometimes use cocaine to dilate the nasal passageways, chronic use has caused perforations and obstruction.