When there are scars that you will see after rhinoplasty it is very important to have an open and honest discussion about the pros and cons before surgery. Alar base scars both in the "alar crease" and in the nostril sill can be noticeable and possibly asymmetrical. Sometimes if the healing does not produce a smooth contour, the two sides can be realigned surgically. Sometimes the face is asymmetric and the level of the nasal base is different and so it can be hard to "line up" evenly.
Dermabrasion works well for alar base reduction scars. However, your scars made need additional attention with scar excision and meticulous re-closure.