It's his own scar. I think he got it while filming some movie a while back, and the editing team decided not to edit it out because it made him look more worn and weather-beaten.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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