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I have never had a bird with this ailment, however there is a condition called Rhinitis, swelling of the nares/nostrils in birds. Sometimes it is accompanied with nasal discharge and other respiratory issues, sometimes not. Did your bird have any discharge or even wet nostrils?
Many times Rhinitis is caused by bacteria, fungal infections and even too much dander breathed up the nostrils and causing blockage. Even a poor diet can cause this ailment as well.
If in the future you see this again, and it is accompanied with nasal discharge, make sure to clean the nares really well each day with warm water to keep the discharges from blocking the air ways. Antibiotics may even help with this condition.