Forearm flexor tightness, adjacent to ulna

This is a bit of a long shot, but I sometimes find myself with a very tight 'side' forearm. I mainly boulder, and it seems to happen when I have been limit bouldering or otherwise trying hard, and it also seems to coincide with my forearms not recovering 'normally'- feeling a bit pumped instead of fresh 2-3 days after bouldering. 

Anyway, what happens is the 'side' of my upper forearm flexors, adjacent to the ulna (and closer to the elbow than the wrist), gets really sore when I massage it. For example, if I extend my arm, palm up, and rub where the forearm flexor 'meat' meets the ulna (i.e. the ground facing side of the forearm in this position), it is very tight and sore, even 'knotty' (like foam roller knot pain, not injured). The flexors coming out of (?) the medial epicondyle are all sore too, but in a more 'sore muscle' way. Sometimes when I do 2 point planks (one arm one leg up), I feel pressure in the same place, mostly after I release from the plank. In general, my forearms are pumped when this spot is the most sore, but it is definitely a different type of soreness (again more like foam rolling knots vs sore muscles). 

Has anyone dealt with this? Am I just late to the forearm massage train and haven't been very comprehensive in doing it before? It isn't really holding me back, but seems like it might be a precursor to golfers elbow or something. 

Curious to hear thoughts, thank you! 

Max

Sounds like golfers elbow (or at least a mild case) A golfers elbow/tennis elbow band helped me out.

Just put the bump over the tendons and tighten it. Wear it while you workout. It helps a lot.

You could also try the theraband forearm rods for strengthening once the flare up diminishes.

Representative picture of band....they're all basically the same. Get whichever is cheapest.