I noticed that some of the acorns on my live oak have this fuzzy, spiky growth. I'm in Myrtle Beach, SC and we've had a pretty wet spring/summer with some flooding. (I posted a photo of the flooding across our lawn a couple of months ago. This tree is probably about 30 metres from the edge of that flooding.) We have sandy, well drained soil.

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There also seems to be some spotty damage to the leaves around these little acorns.

Is this something to be worried about?

(My guess is that it's galls, which I know are mostly harmless, but I haven't had any luck finding information in a Google search, so I'm here with photos and questions.)

Thank you!