Here are some more pics of my cory's fin. What is that raised bump on his front fin? I can't find it anywhere.... I'm pretty sure it isn't ich. Please help.

New pics. I hope you can see the dot now. Sometimes it blends in with the rocks.

I have a Corywho seems to have a blister or ball on the top tip of his front fin. No other fish in my tank have any signs of a disease. Have researched and can not find anything similar. I found it on him after he was swimming frantically around the tank a few days ago constantly gasping for air ...