Koi sick - not sure what it is

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Hi there,

I'm new to koi keeping and have a koi which has developed this scab/rot on it's head.
Would anyone know what it would be, the cause and how to treat it?

I had a lot of water lettuce which nearly covered the whole pond. Which I have mostly taken out as wasn't sure they were causing problems with the water or not.

Thanks
IMG_20220425_115717.jpg
 
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Google "hole in the head disease". No, I'm not being a smart aleck - that's literally what it's called. It's a parasitic infection.
 
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Google "hole in the head disease". No, I'm not being a smart aleck - that's literally what it's called. It's a parasitic infection.
Oh ok thanks for that.
Love your pond by the way. Have been reading these forums for the past 4 years before building my own pond.
Have learnt a lot from your posts.

Thank you.
 
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Ah... thank you! That's always nice to hear. We love our pond - it's the highlight of every single day for me!
 

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