Thanks for your reply. I hope you are right, but I figured I might give a bit more context here just in case…
Few days after pressing my apples and put the juice in the carboy I could see that the fermentation process was going. Nice foam on top, airlock bubbling frequently..
But yesterday I’ve noticed those withe spots on the side (that’s what I was trying to show in the picture), and this morning those white spots have increased in number, and the airlock isn’t bubbling as much.