Hmm... are you positive that he had a hole in his shirt after the attack? My first guess would be that it was a stab wound from an Orc blade, but a wound like that would start bleeding, and I don't recollect seeing Frodo visibly bleed in Moria. Another possibility was that he was hit very hard with a blunt instrument, perhaps a club, which severely bruised/scraped him. That would exclude the possibility of blood soaking through the shirt, would most likely tear the shirt, and would result in scarring, especially in someone as fair-skinned as Frodo.
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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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