I don't know for sure....maybe, but I'm thinking something else. Is it possible it was injured, or a bacterial infection? Can you tell us more about your pond, so we can make some educated guesses?
I agree, looks more bacterial, It's NOT Carp pox. carp pox looks nothing like that and it's rarely associated with redness when it first develops. Also carp pox rarely shows up in warm water, It shows up more in the cold weather.
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