Thanks for writing to H.C.M.
I have gone through your query regarding recurrence of nasal polyp, as you have told about operation about 10 years back.
Here I would like to tell you that most likely you are having ethmoidal polyp, because these are usually bilateral, and are in bunch with higher tendency for recurrence.
Since your nasal polyp had recurred , no doubt surgery is only treatment but now after surgery you please use steroidal nasal spray
for at least 6 months to avoid recurrence.