Illness/Sickness: White patches on axolotl's tail

[Derangedcorgi]

There was a temperature spike in my area recently and the tank went to around 75~78F I tried to keep the temperatures low but I could only get it down by a couple degrees. One of my albino axolotls developed some white patches on its tail, I'm assuming it's a fungus of some sort so I placed it in a salt bath in the fridge and it'll stay in the fridge for a day. Can anyone identify this illness? It's the only one with this, everyone else is fine.

 

[Bellabelloo]

It looks fine, those white marks are all normal

 

[Derangedcorgi]

It looks fine, those white marks are all normal

Phew, thanks! Going to let it warm up before it goes back into the tank