Can anyone help me please

[Alcandoit]

One of my koi has developed a suspect looking area. My pH is 6.5. I have used an anti parasite treatment, but it is not improving. Thank you. I have a picture of the problem but don't know how to upload it

[g mac]

How are your other fish behaving?
Do you know what parasite you were treating for?

I would be checking water parameters first: chlorine, ammonia, nitrite, nitrate, Kh etc.

Then taking a mucous scrapes to inspect via a microscope. If you don't have a microscope, do you know anyone who does and would be willing to help?

Meanwhile if you can sedate the fish and clean/treat the wound that would be a good start.

[big h]

Why dont you put where you are.A local koikeeper might see this and pop round

[Maddog1]

Buffer your KH up!

[Alburglar]

Probably bashed itself and has a dead scale which has got infected. Pull fish out, sedate, tamodine the area and see if the scale pulle out.