green mandarin problem

[firemedic222]

A few days ago my green mandarin developed a large blister like white/clear bump on its side. It still swims normal and is acting as I would expect it to... Yesterday it seems to have popped or opened up. Still no change in behavior as its as shy as ever. Any idea what it might be? Lymphocystis, ulcers, a parasite, anything?

I also have a short YouTube video... Green Mandarin Problem - YouTube

 

[TrialandError]

Sorry no idea what it is but tagging along to see if anyone else knows.