Thank you so much samsaraedu! When I took a second look at my plants one of the other ones had bark that looked strange. But I can see that mine is aging its bark like your plant in your photo. The bark lesion of the plant I originally posted about is actually a bit mushy in the dark brown crack though. I think the light grey patch was the bark hardening but it must've gotten wounded somehow

Here's another angle of the bark

Usually the branches phase in and out of dormancy so from the dead of winter brown dry look, they go a more burgundy red then green up for the flower and fruiting stage of spring/summer. Then come Fall the green turns scarlet red along with the leaves. Even after leaf drop they will remain scarlet for a while then transition to brown ash color.

Its difficult to tell what you're talking about in the photo but as long as the red dots dont move (spider mites), it maybe still changing or just a little wind burn from previous season. Some of mine still have burgundy all along the side of the branch like they are waking up even though fruit is hanging from the end.

Wow I never knew that branches could change color based on their dormancy. Most common deciduous bushes or trees in the suburban areas never transition like that. The only one I know of is the red twig dogwood.

To be more descriptive the red dots are more like red blisters on the bark. Since I've never experienced transitioning bark like that, I'll keep watching it for now to see if it's going through its normal process. Small indicators and signs like this are rarely mentioned in blueberry care guides or articles. I'm glad I asked on gw! Thanks so much for explaining it to me :)

I cant seem to get a picture but I see some spots almost like a freckle on a few green branches. Some are along the branch random as opposed to a red dot where a new leaf or branch seems it will emerge from a bump/blister. Perhaps these are what you're talking about?

What kind of blueberries were they? I may have more info for you.