Identifying this disease/damage

Hi all.

To me, this clearly is not mould. My next thought was Botrytis, BUT, when one cuts the damaged area “out”, it clears up as seen from pics. Botrytis (as far as I understand) comes from the inside to outside. This disease seems to be outside - in. Could anyone assist?

After damage is cut away

Look for broad russet mites… 60 to 100 × zoom… :wink: