Light source in the part?

I figured out the cause of why this weird “under glow” thing is happening but the problem is I need both of these options used to make the game more realistic as its a horror game.


image
When I remove both of the options it removes the weird under glow but also sacrifices the realism factor.
[https://gyazo.com/5bd2aaec31bdf9bda13996ee1c0734fb]