You need a plain CT scan of your paranasal sinuses. This will give your doctor information on the source of the snot and on how to manage the condition.
Next Steps
If you are in Bangalore, please come down to my clinic which is located on West of Chord Road, 5th Block Rajajinagar. Having my cliNic attached to a Diagnostic Center, I can personally scan your sinuses and give you a video report immediately, instead of having to wait 24 hours for a Radiologist's report.