Maybe it's tendonitis? Inflammation of the tendons that occurs when repetitive movements with more or less stress are performed. Tendonitis does not go away for a long time, it can last for several months even after you have stopped the physical activity that caused the disease. Rest, drink plenty of water, apply anti-inflammatory ointments and compresses, this is the treatment for tendonitis in most cases.
I can guess: bundles? muscles? The pain sometimes radiates, that is, the pathology in one place, and the pain spreads much further.
If the pain is persistent, then it may be a symptom of a joint problem. There is very little information about the nature and appearance of pain.
However, here's the structure of the elbow and knee bend (muscle layer)