Hi Jessica,

I think you have two separate issues.

The bumps are galls on your tree and pretty harmless;

https://extension.umn.edu/yard-and-garden-insects/insect-and-mite-galls

I'm not sure what the black leaf tips are caused from. It could be leaf scorch;

https://www.canr.msu.edu/news/leaf-scorch-or-oak-wilt-what-s-plaguing-my-tree

However, I think it's bacterial leaf spot. Scroll down in the next link. I'm starting to see this in other trees in Hennepin County.

https://extension.umn.edu/plant-diseases/leaf-spot-diseases-trees-and-shrubs#bacterial-leaf-spots-and-blight-1156513

I hope this is helpful,

Sally Granath

St. Louis County MG