I got a pike thats developed sum hole in the head i believe. hes got like whiteish skin and wut looks to be deteriation around his head and down his body. I guess to jus pick up the medicine for hole in the head.
Hole in the head usually starts off as pitting and in the hole you can see a white to yellow parasite.
Look under hole in the head, and lateral line. http/www.fish-disease.net/diseases.htm