Lower Columella Missing After Rhinoplasty

It's difficult to tell with certainty what's going on but it looks like a "step off" below the scar. The skin looks like it was not aligned as best as possible. Occaisionally swelling can give an appearance something similar but not usually quite this obvious. Check with your surgeon and explain calmly your concerns. If it is a clear cut misalignment than you could have a scar revision probably by 3 months after surgery.

From looking at your nose from that angle alone it's hard to say what is going on exactly. Some patients can get  quite a stepoff at their columellar incision, due to tissue swelling above the incision.

There is a possibility of developing columellar retraction. I would check with your surgeon to get a better assessment.

Again, without having performed the procedure and examined you in person, it is impossible to offer the best information.  In general, from your complaint and the photo, I believe you do NOT need to wait a year.  The irregularity may be related to underlying septal, medial crural, or columellar strut graft issues.  If it is only related to the way the wound was closed, this is an easy office revision.  If there is a true shortage of columellar skin, perhaps a Y to V type advancement can improve.