It's a viruses infection called lymphocystis. Can be brought on by the stress of spawning. It's just a skin infection,no harm to consume the fish,but ugly as he- - and freaks me out also. The infection is only in the skin not the flesh.I've caught a lot of Pymy eyes with this infection. It's actually better to keep the fish if legal so other fish don't get infected. I caught quite a few deep water out of Erie and on the Maumee river. I would have loved to fish tonight but last night beat me up bad long night for 3 males. 17- 19.5 It's a long trip for me. My buddy hitting Maumee out of his boat getting his 3-4 keepers a day. That even a longer trip,it not worth it to me to go there anymore,I rather hit Pymy. Oh don't tell anyone but one year I fillet all the fish with the warts and gave them to my relatives,damm there still here mooching more fish off me. I've even eaten a few that had it on there head or cheek and I'm still here. Ate to many fish from Erie before they had health advisorys on them also.