This piece of thin, flexible translucent thing came out of my R nostril after blowing my nose. What is it? (Photo)

In August, I underwent a Rhinoplasty to fix R sided valve collapse in which a rib graft was used. Additionally, my ENT surgeon n placed a PDS plate to fix a septal perforation. Since surgery, I've had a continuous runny nose. This past week, I developed a cold with a sinus infection, causing large amounts of mucos and the need to blow my nose. Before this came out, my R nostril felt very blocked and air was unable to pass through. Since it came out, my nostril is clear and I'm able to breath through it.

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