My Koi. Help Needed.

I have had a mark like that on a couple of my koi in the past, it could be a number of things but most likely a bacterial infection. The problem is if all the fish are affected or just the one.
I treat mine by using a small paint brush and painting the wound with malachite green every third day until it was gone. Malachite can be added to the pond but make sure to turn off any UV as it will stop the treatment working.
 

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