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From comic book hero Spawn to the undead in Tolkien’s Middle-Earth, undead creatures are often portrayed with glowing eyes, or glowing body parts.

Which looks rather dramatic, but is easy to explain – as this article does:

Mental Floss – Why Some Civil War Soldiers Glowed in the Dark

Now, the article tells this story as if it was something new and sensational, which is not true: I remember to have heard similar explanations for similar phenomena many years ago already, I think in connection with explanations of vampirism.