Nasal polyp in one nostril

Hi guys, I wish to ask,how common it is?
I found it only today,it is slighly further in nose,but I can see it with torch.
I was blowing my nose forcefully and then looked inside it and found it by accident.

I looked it up online and found out that polyps are common in both nostrils,but in one it may or may not be something serious.

Is it possible that I caused temporary swelling by forceful blowing of nose, or if it is polyp, how common is it to be in one nostril only?
What are the chances for it to be a cancer or tumor?

Can you guys calm me down a bit? Thanks Tweet