Rick,

Jonathan if this has a whitish appearance it is likely a fungal infection.
You can net the fish and while gently holding the fish in the net apply
some
meth. blue or other anti fungal medication directly to the spot uisng a q
tip.

Although a little secondary fungus appears to be showing up, most of it
appears to be internal swelling. So I don't think dealing with the fungus
would take care of the problem.

Thanks.

Jonathan