It'll be fine. Don't worry about it. Let it carb up an drink it. Nothing in there will kill you. In the unlikely event it is mold, there will be off flavors. I have recently had the same on the top of my fermentor. They don't always ferment the same way. Different yeasts do different things. If the top of the fermentor looked like a white fur coat, then it's time to worry.
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