Definitely does not look like HITH.
post your water parameters
PH, GH, ammonia, nitrites, and nitrate readings
You could try a 30 minutes methylene blue bath for 1 week, everyday. Mix 1ml of methylene blue per 1 gallon of water, and add about 1 tablespoon of salt per 5 gallons in a separate container/tank. Place the fish in the bath for 30 minutes with an airstone, and make a new bath everyday. I would use your old tank water to make the bath.