I think what my betta's have is those gill...flukes or worms or whatever, but i'm not sure.
Two of my female bettas have one gill raised and what looks like a peach blob underneath them. One's been like this for a while, the second one just got it and is being sluggish and breathing heavy. At first i thought that it was a bite wound that swelled, but since it hasn't gone away and with the second one now having this bulge (which is why i checked the first one) it's making me worried.
Other fish in the tank: Male and female bettas, mollies, cory catfish, SAE