If you apply it inside and outside of the nose in the bulbous area over time it can reduce the size of the bulb. You should thoroughly wash the area you are going to apply the Preparation H to, both just inside (remember this is used in even a more delicate part of our bodies) and outside. Please discontinue if this causes discomfort. I am not a Doctor but it worked for me.

It obviously works just like it does on hemorrhoids and eyebags (recommended by the Mayo Clinic web site(eyebags not nose)) and its effectiveness is probably affected by the age/ hardness of the bulb.

More Info: www.reference.com