Eyebrow nerve twitches hairline point on touch

Hi,

I bumped my eyebrow on a door-edge very slightly and had a little bruising(not visible) which I expected to go away in a few days.

But now that the bruising has gone I have a strange symptom that when I touch the point that was bruised with my finger, a corresponding point directly above in my hairline feels it too.

The best explanation is to take a group of hairs along your hairline front directly above a point on your eyebrow and then tug them such that you feel the tug where they connect on your sculp.
Now imagine that you get that feeling alone when you simple press your eyebrow.

What has happened?