What is going on with the leaves on my valley oak

[chris_anderson]

I have one valley oak that has som small fleshey bumps on it I removed them maybe some kind of pest. Any way I found them after I noticed the leaves looked like this (see photo). Anyone else ever have this happen?

[MartyWeiser]

My guess is Oak leaf blister - Oak Leaf Blister (missouribotanicalgarden.org).