Downtoearthdigs
Answered on May 18, 2019
How interesting! This is not something I had seen before so a little research show this is a Wool-Sower Gall.
It should not be an issue, but worth watching.
This link has more information.
https://www.inaturalist.org/posts/6119-wool-sower-gall-callirhytis-seminator
It may also be of interest to your County Extension Office.
https://www.gardeningknowhow.com/extension-search
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