worm

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...

I have cycled my tank and all the levels were good I added 2 albino Corydoras yesterday and today I have these white things growing they look like the white fluffy things on dandelions and there also was what looked like a white worm sort of thing very tiny moving on my glass, my betta is due to...