How do i fix glitched citizen head?

I made a hex of a civilian, though it turns out the model i used is from an old version of the civilian model, and the top of head has this “glitchy bald spot” it keeps flashing, disappearing and reappearing, the bald spot seems to be a stretch of a bright pixel, as well as a seam from the inside of the head.
So is there a way to fix it? Like go into blender and do some master modelling skills to fix the seam or something?