You are allowed to undergo this surgery since it does not amount to disfigure the nature; rather it is enhancing it by removing an abnormality.
For details, you may refer to the following answer.

• I'm a man going through a very traumatizing experience; I ‘m 23, and my nose bothers me; it works perfectly fine (for breathing), but it is unusually large (like a balloon). I have had a lot of psychological effect causing me depression and melancholy. Does Islam allow a nose surgery if it causes extreme mental distress? My family calls me 'big nose'. Everyone notices it being extra fat, but doesn’t make fun of it; it’s just the way Allah made it. But it sure looks out of place. What is to be done?