Stephen, you have come back time and again over one issue or another, repeating the same questions. You do know what to do you have been advised.
Obviously, if its fungus, salt baths.
If he's stressed, then you have to work out why, as asked in previous posts:
* Have you tested your water parameters for ammonia/nitrite/nitrate
* Did you quarantine the 2nd axie for 30 days before adding him to the tank
and also;
* Are there any feeder fish or other companions in the tank?
* What is the temperature?
* How often do you spot clean?
* How often do you waterchange?
All these things can effect your axie. Your axie is probably stressed and rubbing the stuff of the other day, probably didn't help just added to the stress.
It might be better if you separate/remove this axie from the tank and very possibly, if your temperatures are still warm, do saltbaths twice daily and put into the fridge to recuperate.