Goldfish illness

[Shaywick]

Hi,
I was wondering if I could get some advice on an abscess growing on my goldfishes head. I have owned goldfish and other fresh water fish and this is first time I have come across this problem. I have a Ryukin goldfish with a lump on his head that has slowly grown over time. All other fish in tank are fine and I now have him separated to quarantine tank. The abscess is squishy and white stuff drains from it if you touch it. Any advice on what it is and how to treat. I have tried Melafix.

 

[Uberhoust]

I have no idea what the issue is, I suspect your lack of response is because others are not sure either. The fact that the growth seeps fluid is not a good sign in my way of thinking. I would suggest adding some aquarium salt to the quarantine tank, though I don't know the dosage I would use, someone else might have a better idea.

 

[Kyshiara]

Questions that might benefit other people who can help you:
Water parameters?
Tank size?
This fishes age?
I hope someone can help you