Koi injuries

JacobLindsay

This might not be the place for koi but I figured I’d ask this community first. I have an outdoor pond with koi and goldfish. One of my koi is either injured or sick and I don’t know what it is. No other fish have similar injuries or markings. I haven’t seen this koi being picked on and again no other fish show injuries or signs of being picked on so I’m leaning more towards sickness. I attached pictures they’re kinda blurry but I couldn’t get closer. The markings are on the gill, the top fin and the tail. What does this look like, how do I treat it and how do I treat it if I don’t have a quarantine tank large enough for a koi?
 

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