I recently had rhinoplasty and septoplasty and I found out today that there is a metal rod in my columella. Any suggestion?

It sounds like you had a complex operation for a challenging problem - most likely revision rhinoplasty. Depending on the scenario, some rhinoplasty surgeons use so-called K-wires for stabilization and fixation. Your nose will change a lot over the next 12 to 18 months - currently you see only a pre-view. Stay in close touch with your surgeon whom you trusted in the first place.

Some surgeons use a K-wire which is a stable thin metal wire that is often used in hand fractures.  It is sometimes used to stabilize rib cartilage grafts to keep them straight and to also secure the graft so it does not shift.