Bulge, back left side neck in splenius cap muscle area. only felt when head tilted. causes dull ache. not noticable on right side. doctors don't know.

trigger point: This could be a muscle knot referred to as a trigger point. Seek a doc with knowledge of this, often osteopathic docs are better educated or someone with fellowship training from the am acad of anti-aging medicine. Often these can be relieved with one to a few injections. Add mg glycinate several caps two or more times per day as mg relaxes muscles. Massage by skilled hands can also be helpful.