Without seeing what this "blemish" looks like, it is difficult to determine what this is. Unless this is a muscle spasm from muscle irritation, I am not sure what this could be, from a neurologic perspective. Things in this region which could "swell" include muscles and lymph nodes. If this is a muscle spasm, it could be secondary to a disc problem in your high cervical spine. If the belmish is new, I would return to your PCP for another look. I wish I could be of more help, but without seeing the lesion it is difficult. Good luck.