Torch disease ID

[Bo2022]

I bought this indo green torch last week, today I saw a purple and black spot like shape in one of its hands. What is it? It doesn’t look like worms or a parasite. It doesn’t seem to be attached to the surface more likely it’s growing from inside. When I blew on it, it didn’t come off, but the spot disappeared but not gone yet, leaving a slight indentation on the surface. Maybe will it become a bicolor torch? Anyone know what is it?( I have attached videos but idk if it can be viewed cuz when I tried to open the videos I attached it won’t load up. )

 

[N1tew0lf1212]

@vetteyguy what do you think?

 

[Bo2022]

done dipping and two of it came off. I think it’s flatworm but more brownish