Withe Spots on Flowerhorn Fish

I notice on my flowerhorn fish (Sakura is his name) 3 withe spots. I'm alarmed that it might be any fungus or sickness. Could anyone advice me what to do. I'm rather lost on how to cure it and afraid it might spread.

Thank you for your advice in Advance

Stephan

Do a 20% water change and introduce a heater at 30 degees. It should go away in 2-3 days.

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