Yes, water parameters are good. The fish was originally kept in an outdoor pool but has been separated into a plastic container where the water was regularly changed. We're now giving him/her a treatment of Prazipro. Hopefully that'll do the trick.
I don't think so. The cyst/bump on my fish is not transparent, it's just a bump that keeps getting bigger. It's almost like a pimple, just before it bursts the top gets somewhat white.
I have a goldfish that suffers from some sort of parasitic infection. The symptoms are a bump that appears near the head or dorsal fin and grows for several weeks and then finally bursts. It looks like there was a worm inside however it doesn't look like the usual Anchor worm photos I've seen...