This does sound like one of the multistage helminth (flatworm) that encyst just under the skin. They seldom seriously damage the host and don't generally infect other fish in a captive environment.
There is no posted cure that I can find but you might try the antiparasite medicated food made by jungle. The problem is thatthe parasite is not accessible to topical meds as it is sealed under the skin.
I have treated some young flounders that were lightly infected with a similar parasite by using the tip of a hypodermic needle to punture each cyst and cut through the body of the worm. This was possible only because each flounder only had a few cysts. After being killed the worms slowly dissovled awat though they did leave behind a bit of discoloration.
There is no posted cure that I can find but you might try the antiparasite medicated food made by jungle. The problem is thatthe parasite is not accessible to topical meds as it is sealed under the skin.
I have treated some young flounders that were lightly infected with a similar parasite by using the tip of a hypodermic needle to punture each cyst and cut through the body of the worm. This was possible only because each flounder only had a few cysts. After being killed the worms slowly dissovled awat though they did leave behind a bit of discoloration.