clownfish skinrot?

[romsoccer12]

where the body of my clownfish meets the fin, it looks like his skin is rotting away or like a scab being ripped off
he eats extremely well and i havent noticed any difference in behavior

any advice? maybe a freshwater dip?

 

[WaffleWalffle22]

I would treat him for ich.

 

[romsoccer12]

i have 4 other fish that are showing no signs of ich, or any other disease/infection.
if i treated him for ich, and he truly had ich, putting him back into the tank would just get him reinfected.
the wound honestly looks like a piece of his skin got cut off. the rest looks like white scar tissue with some red, i think blood.

 

[romsoccer12]

it looks like his skin is being eatin away in a large wounded area
any treatments to get online anyone would advise?