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The mark on the end of the gill and where the color is rubbed off the gill plate is classic signs of rubbing/flashing koi attempting to dislodge a paracite. As with most cases of koi problems, there are tons of problems waiting to happen and once the gate is open ( rubbing to open an entrance for infection) all kinds of other problems present will take advantage.
for those quiet readers, Mike and Marco's comments both lend themselves towards the importance of having the ability to move a troubled koi into a proper facility. In my years of experience most keepers throw something together at the last minute and the water is even worse than in the pond and that creates more problems for the koi in question.
I could talk a lifetime about diseses and treatment but you know what i arrived at over time? Learn about keeping water, understocking, irradicating paracites.
It's called prevention. An ounce of It is truely worth more than a pound of cure!
But to address Bedskoi, It's hard to diagnose a problem from a picture. ( that's why most docs have you come in when your sick ) but if that koi were mine I'd be looking at a salt treatment and rising temperatures.
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