Anyone have tendinitis on the back of their hand?

I have had these bumps on the back of my hand for quite awhile. They change in size and pain quite a bit.
Doc thought they were ganglion cysts but the ultrasound results came back as thickening of the tendons.

That was a few months ago. Since then I have started exercising a lot more and it has been flaring up.

Any one else have experience with this and find something to help. I’m going back to my doctor soon.