Bad Smell from Nose After Septoplasty. Took Penicillin For Infection With No Results?

Abnormal smells following septoplasty surgery may be caused
by a variety of problems.When these
smells are encountered six months after surgery they should be aggressively
investigated. It’s therefore important
to be re-evaluated by 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 packings. In the
majority of cases, nasal cleansing with saline irrigation will solve the
problem. In some cases, antibiotics may
be helpful, while in other cases surgical debridement may be necessary.

You should see an ENT or seek a second opinion. A doctor will need to examine your nose to determine the true cause of the problem. 

Early after surgery, this is the result of healing tissue or a sinus infection.  Months out from the surgery, the likely cause is a foreign body.  Have your surgeon look for an exposed stitch or other implanted material.

This is indicative of dead tissue from a perforaon or a foreign body. Have an endoscopic exam to find and cure the problem

 You should have an examination of the inside of your nose to rule out an infection of the inferior turbinates or a septal perforation, by your Rhinoplasty Surgeon or an ENT Surgeon if he/she wants to refer you.