I was listening to some cover of Cruel's Angel Thesis when I stumbled upon this image:
Since every other image used in the video does come from NGE/EoE, I am inclined to think it does come from an episode of Evangelion.
However, I don't recognize the scene, and don't know of any character with such a... scar, nor its use.
Does anyone remember where it appears? What is it and what is its purpose?