My yorkie has a weird bite mark or something similar near the back of his neck. Here is a picture.
https://www.dropbox.com/s/e2c00k21os...20517.jpg?dl=0
He had a tick on the inside of his ear recently. This was removed and not near this mark. I also then applied flea and tick frontline protection on the back of his neck. It wasn't direction on the area of this mark, but the area is just above where I applied the frontline... about an 1/2 inch above.
It kind of looks like some missing hair with a pimple like thing in the middle.