Is this a developing gall?

Is this a developing gall?

Observation - Is this a developing gall? - UK and Ireland. Description: I noticed the whitened protuding points on the upper surface of some oak leaves. There were depressed patches on the underside, with an insect next to one.. However when I looked under my microscope it was clear that there was a different, flat orange ins

I noticed the whitened protuding points on the upper surface of some oak leaves. There were depressed patches on the underside, with an insect next to one.. However when I looked under my microscope it was clear that there was a different, flat orange insect at the bottom of each depression, stuck down with a fringe of hairs. It occurred to me that this could be a gall causer at work, though it could be just a scale insect. Can anyone confirm or deny this?