Help!! My beta fish developed a shiny blue line on his upper lip?

[rainmelodies]

Help please, I can’t find any information on this at all! I got my male beta fish two years ago and he’s a very healthy, multicolored (blue, red, yellow, green) fish who’s been eating, making bubble nests and loves to get my attention to get food. This is what he looked like the past two years (unfortunately the only good pic I have):



He then developed a shiny blue line on his upper lip two weeks ago, pictured here:



The rest of his body is fine, he still swims and does the same beta fish things as before, but I’m concerned. I haven’t really changed the tank cleaning routine much. It doesn’t look like fungus, it’s not cottony, there’s no swimming problems… perhaps he’s changing colours? I don’t know, please help.

 

[grac3]

Does it bulge out? If not, it's probably just his colouring and nothing to worry about

 

[camposagrado48]

I think he'll be fine. Bettas can change their color slightly as they grow old. Unless it is a growing mass then yeah that's bad.