Still really hard to tell in those pictures. But if it looks like a wart or cauliflower looking bump, it's Lymphocytis.
If it looks like the flesh or fin is "rotting" away, it's a bacterial infection. Most infections will create holes, indentions, or some sort of concave impression where the flesh is dissolving.
Lympho will be on top of the skin or fin like a growth. I've even mistaken it in the past for a fluke or parasite attached to the fish. I can't say it any other way other than it looks like something "attached" to the fish. I've seen it on both fins and the skin. I've also seen it pop up in a couple different places before it finally went away. I've even seen it pop up as a string of small bumps along the lateral line of the fish.
As long has he is swimming normal and eating, i'd leave him be. I don't think you'll accomplish anything by capturing him and medicating him with multiple antibiotics, all of which will also stress the fish's immune system, along with the stress of being caught and placed in a hospital tank. Just my opinion of course.