The sauce was to expire in Nov 2013. I kept it in the fridge all the time. The thing that grew on it was white in color (just like cotton). There was a greenish center. The overall "ball" was about 1 cm in diameter, and they were all over in the bottle.
I don't have a picture of it, because I had to throw it out. I don't know what it was, or how it started growing.
What was it? Why was it there?