One of my goldfish has an open sore on top of his head. I noticed it last winter when they were in the 100 gal stock tank. They are all outside now in the pond. It isn't getting any bigger or smaller. It's just there. It kind of looks like there is a small chunk of flesh missing. It doesn't seem to bother him at all, but sure bothers me. If a picture would help, I'll try to get one this weekend.
Any reasonable suggestions would be welcome.
Thanks,
Steve