This looks like lymphocystis which is caused by a virus that usually shows up in fish that are stressed and will go away when the fish stress lessens. I’ve seen it on crappie and drum here at El Dorado and on crappie in NE Kansas when I was up there. You can Google it and get all kinds of info. Lymphocystis certainly gets a lot of attention from anglers as it can be some crazy looking stuff. I’ve always described it as ‘pinkish cauliflower’ growing out of the side of a fish.
Good pictures Tim!