well its a parasite and not much is really known about it. you can do a couple of things to treat it:
1.a fresh water dip with water the same temp and PH as your water for approx 15 minutes
2.Giving a bath with saltwater and formalin at about 1000ppm for 15 minutes
3.or adding an acriflavine product such as Fish Vets Revive

Best of Luck