What are the signs someone has had fillers in the nose? Can a plastic surgeon/dermatologist tell?

Hi and thank you for your question! For injections done skillfully, it is often very hard to tell without doing a comparison with before/baseline pictures. Also, the type of the filler used in important since hyaluronic acid fillers tend to blend in with the naturally occurring hyaluronic acid in skin and they will be much harder to tell apart. I hope it helps and good luck!  

Results of a non-surgical nose job are natural looking and most won't assume you've had fillers unless looking at before and after pictures. These fillers (voluma, restylane, juvederm) can be used to improve the symmetry of the nose. Surgery would be needed to improve nostrils or overall shape. See an expert. Best, Dr. Emer

With good injection techniques, you really shouldn't be able to tell if someone has had a liquid rhinoplasty. The correct patient and the appropriate filler are the two most important decisions to be made with injectable nose jobs.  In my hands, I like Vollure in the nose.  It's easily moldeable, doesn't leave bumps and lasts up to 18 months.  It's also great for correcting the smallest of assymmetries.  

Fillers in the nose are a great way to change or improve the shape of your nose without resorting to surgery. If done carefully and correctly, it should be not be noticeable that someone has had fillers in the nose. Too much filler or filler in the wrong area may make the nose appear distorted or disproportionate to the rest of the nose and face. It is best to have an in-office visit to examine your nasal anatomy and determine the best treatment plan that matches your goals. Hope this helps!Johnson C. Lee, MD Plastic Surgery@Drjohnsonlee

If done well with the right fillers in the right place nobody will be able to tell that this has been done. if you are contemplating rhinoplasty surgery make sure that you tell your surgeon because there are potential complications with surgery after fillers.

When someone has fillers in the nose to correct an irregularity or to lift the nose, it should not be readily apparent.  The nose should only appear more refined.  The patient may be able to breathe better after treatment and this would be apparent to the patient only.  
Hyaluronic acids are the safest products to use in the nose because they can be dissolved if there is a vascular event (occluded vessel) which can compromise circulation almost anywhere on the face, including the eye.  Circulation never follows textbook patterns and after rhinoplasty or nasal fracture, arteries can have unpredictable pathways. 
In my experience, patients are very satisfied with minor improvements because many are acutely aware of their appearance and have been disappointed by the results of an injury or even surgery.  Also the airway can open and breathing become easier for many patients.  
Be sure to choose an experienced physician to correct any minor nose deformities and to see a specialist in rhinoplasty when considering surgery.