Board Thread:Skyrim/@comment-107.210.230.189-20140302140101/@comment-24261859-20140303014530

More or less what happens is that npcs with effects applied to them do so via a spell, e.g. "Draugr abilities" which adds the glowing eyes and a slight shadow around them. Spriggans have the same thing. The effects of these spells can occasionally be applied to the player. PC players can fix it by using the player.addspell command to get the full version of the spell, then using player.removespell to get rid of the whole package.

Sadly, this is not possible on Xbox.