My Nose Has an Odor Like A Bad Smell Inside, I Had Rhino 3weeks Ago

Usually, this is caused by there being old blood or crusts inside the nose that bacteria thrive on.  In these instances, clearing the crust will make the problem go away.  Saline nasal spray will slowly wash away the crust without the trauma of nose blowing.  If you are not having increasing pain, redness, swelling, fevers or drainage, its unlikely to be infection.  Either way, keep your surgeon in the look especially if the smell doesn't go away after a few days of the saline nasal spray.  It may be that he will need to look in your nose to see what the issue is.

While this is not unheard of it is usually uncommon and can mean several things.  The key is an EXAM by your surgeon to look inside and see what is going on. It is usually from xs dried mucous or tissue that is not alive and must removed.  An infection can also occur but it is quite uncommon.  Using saline nasal spray may help but most often your surgeon needs to clean out your nose in the officeDr Rahban

Abnormal smells following rhinoplasty surgery may be caused
by a variety of problems. When these smells are encountered three weeks after
surgery they should be aggressively investigated. It’s therefore important to
see your surgeon as soon as possible.The
smell that you describe could be related to a large number of potential
problems. These may include nasal or sinus infections, wound healing problems,
necrotic tissue, crusting with retained mucous secretions and retained nasal
packing.In the
majority of cases nasal cleansing with saline irrigation will solve the
problem. In some cases antibiotics may be helpful as well.