Updated video on my mandarin with weird growth for info, I'll get more pics tomorrow in day/white lights.
today bubble looks very prominent and whiter on the tip like it's really bulging, (recently read a post about a fish that had abscess and died following day with pictures after death included so thought I would update)
My mandarin is still eating and no changes in behaviour, little worried this may burst but unfortunately not much I can do, if I remember correctly first growth was not as prominent but possibly due to more forgiving part of body as it was lower and on opposite side of body, I'll post more pictures tomorrow, thanks
I know that people try to drain bacterial abscesses, but there is a risk with that unless you put the fish into an antibiotic bath afterwards. Then - this could be an abscess from something else - like I mentioned nematodes perhaps.
Jay