I have a several knots, bumps on the left back side of my head, about equal with the back of my ear that developed while driving my car. I think it could be caused by tension or perhaps my posture while sitting in the car is aggravating a muscle in my back, possibly related to straining it during crossfit.
Hi, Regarding your concern, I would explain that these bumps can be lymph nodes or inflammation. Another possible cause to consider is skull modifications related to calcium deficiency. I would recommend consulting with your doctor for a physical exam. Further tests may be needed like