Could this be an infection?

[Nola_Brew]

Brewed a small batch of Sacred Summit on 9/26. I used 2 one gallon carboys. Both were filled with the same equipment. The other carboy is normal but this one has gray spots. Not concerned with the brown spots as those look like yeast rafts.

 

[Nosybear]

Give it a while. It might be mold, in which case you may be able to siphon the beer from underneath it. They looked like bubbles to me, again, likely no problem. Taste the green beer and see if it's good. That's the best test.

 

[Ozarks Mountain Brewery]

smell it, if it smells musty at all its mold or at least the start of, and mildew will be in the taste of the beer.
most of the time yeast bubbles do not stay on top more than a second or 2

 

[Tar and Feather'em]

Bubbles I bet. Shine a flashlight into the carboy and you will see the bubbles rising from the bottom.