Goldfish has scrape looking thing on side?

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Rykershot101

Feeder Fish
MFK Member
Jul 16, 2011
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Visalia, CA
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Hey guys, I was looking at my goldfish today since I got back from vacation and noticed it had a nasty looking scrape/cut on its side. He seemed to be acting normally but it worries me. Is there some kind of medication I can purchase to put into the water? I'm sorry I have no picture, I'll get one tomorrow probably.
 
Two other goldfish; a ryukin and another peppered looking small one. I don't think it was them who did it, because he's actually the dominant fish in the tank.
 
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