Edit: inserted better photos into post.
Hey everybody! First time fish keeper here. I am two weeks into a new aquarium set up. Long story short, a few days after purchasing a few Neon tetras to begin my tank, I noticed a small white colored dot on two of their mouths/lips. My original research led me to believe that this could be either columnaris or some form of fungus. Just to rule out my options first, I treated the tank with Pimafix and Melafix and added a small amount of salt to the tank about a week ago in hopes that it might clear up. So far, there has been no change that I can determine. I have not noticed the white dot grow and the fish do not appear to be showing any signs of sickness or abnormality that I am aware of. I am doing fish-in cycling, so my water parameters have not been very consistent (though I did use API QuickStart, as well as using some beneficial bacteria provided my LFS).
I have done lots of internet research, but am very new to the hobby and could use some friendly advice for how to treat my Neons and determine what might be going on. There’s A LOT of conflicting information out there. If there is any more info that I can share that might help diagnose the issue, I am happy to share. Right now, I am just a bit worried about the little guys. Thanks!