Nostril reduction, aka alar base reduction, is a highly complex procedure to make either the alar region or nostril region smaller. Once this procedure has been performed it is very difficult to reverse.
Just some insight into its complexity:
There are many ways to perform this procedure. The incision can be made at the corner of the nostril, on the outside, with an internal suture, etc. The nostril size can be decreased or left the same. The base of the nose can be decreased or left the same as well.
It is important to distinguish the width of the alar base from the flair. The flair is the portion of the nostril which gives it an extra curve to the nostril.
Nostril reduction can be performed with a rhinoplasty or by itself. Sometimes projecting the nose (sticking it out further to give more definition) can reduce the nostril flair and width, and a nostril reduction may not be necessary.
