I accidentally discovered a small movable lump on left side of my neck about 2 weeks ago. It isn't visible from outside but is pallapable on pressing. Regarding size i am not sure but it's almost constant I think. It moves within a defined region like as it embedded into something which restraint its motion. Its on the trapezius muscle, outside of the posterior triangle according to me. I am confused whether there is any lymph node there in that region or is it anything else. Quite worried about it as I have health anxiety. Attaching the picture please tell what it could be and what to do?