Spots on leaves of oak tree seedling

I don’t know what kind of disease is causing these awful spots on my oak tree seedlings! I have two, both have these spots. They are a few years old, and the spots have been recurring every year. They seem otherwise healthy. The closest I can find on line is oak anthracnose, however the pics are not exactly like what I have. I suspect it probably is some kind of fungus though? Would some kind of fungicide help?

 

Oak phylloxera, maybe.

 

Thank you! I will investigate!

 

I am very familiar with leaves of my Garry Oaks becoming spotted like this but many oaks besides Garry Oaks can be afflicted with Jumping Gall Wasps.
If you search on the web, you will find lots of information.
If the infestation is great enough, I can actually hear the sound of ready-t0-emerge wasps when I walk under my large oaks . . . sounds kind of like rain. Some years are worse than others.
https://pnwhandbooks.org/node/7233/print

 

Wow! I have never heard of those wasps! Mine don’t seem to have bumps though, the spots are very flat.