Koi has tail growth need help!!

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not sure what you are trying to point out. perhaps a circle on the spot?

I am not an expert but i do not see anything "wrong"
 
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Yep, unfortunately not much can be done for the fish that has it, but to safeguard the other fish in the pond you should get rid of the fish have it. As the article says it is not necessarily fatal, but it can become very large and unsightly and will generally spread to the other fish. Butterfly koi seem to be more susceptible and are more likely to be carriers.
 
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Yep, unfortunately not much can be done for the fish that has it, but to safeguard the other fish in the pond you should get rid of the fish have it. As the article says it is not necessarily fatal, but it can become very large and unsightly and will generally spread to the other fish. Butterfly koi seem to be more susceptible and are more likely to be carriers.[/QUOTE

Wouldn't the other fish already have been exposed to the virus?
 
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Yes, but partial exposure is better than constant exposure. If the water is warm and the fishes immunity is high then they have a better chance of fighting off the virus and not become infected especially if you remove the threat. Leave the infected fish in there, especially through the winter and spring when the other fish's immunity generally becomes weaker, and they will have a higher probability of becoming infected.
Also, if you read in that article, cutting or scraping the pox growths is a no no because ..... "Carp pox is an aesthetic disfigurement rather than a life threatening condition except in the most extreme cases and no attempt should be made to remove or burst the lesions. Any open carp pox lesion will shed the virus into the pond and, as with all viruses, it’s contagious."
So, there are things you can do to prevent the spread to other fish (like removing the infected fish), and there are things you can do to make it worse (like leaving the infected fish in the pond and/or scraping the pox lesion).
 
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