Lymphocytosis will effect any part of the fishes body.It is really only an issue if they form in the mouth and prevent the fish from eating . It usually lasts about a month and while re infection isn't common it most certainly can happen .
Feed your Filtration
Give it to Porc Chop he'll eat anything!!!!!
"This is my tank and these other fish just live in it"
^ Quoted from Porc Chop^