Personally, I have no marks, sores, lesions, bruises or anything of the sort on the area of my scalp
that gets sore
. I find this can also be an indicator that I'm getting sick. I know if it's acting up that it's going to be a rough day, and that everything (symptom wise) is going to be in overdrive, or I'm going to start coming down with a cold.
My spot is right side, just off the center of my skull, above the ear.
I look forward to seeing if anyone else has this and what it could be.