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Not recently, they've been together for months, only these two. The other doesn't have any of these spots. They don't look like ich to me looking to the pictures I found, because these aren't pimple-like dots, they are only on the fins, and "blurry" in a wayJust watch him and see if any new spots appear anywhere else. The spots are on the rays of the fin, which suggests they are cysts from injuries - maybe caused by the other goldfish. They don't look like ich parasites to me, although it's hard to diagnose with a photo.
Have you added any new fish recently?
It is almost certainly not ich and it is most likely scar tissue from fin ray fracture, as others have suggested. Very common in 'fancy' goldfish whose fins are exaggerated. I find it's more noticeable in hyaline (clear) fins such a the dorsal of your young fish.
Does it go away on its own? Do i have to do anything or is it better to leave it alone?It is almost certainly not ich and it is most likely scar tissue from fin ray fracture, as others have suggested. Very common in 'fancy' goldfish whose fins are exaggerated. I find it's more noticeable in hyaline (clear) fins such a the dorsal of your young fish.