Betta losing the scales on his back

Stacey1990

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Hi, hoping someone could help.
I've had my betta for roughly 1 year now and he's done great ever since I got him.
I was on holiday last week and a neighbour (who also has fish) offered to call in a couple of times to give him a few pellets and top up the tank if needed.
When I got back back I noticed the temp in the tank had dropped as the water hadn't been topped up, I think this is relevant. Anyway, when I got back I noticed his colour had changed on his back.
My thought are, because the temp dropped in the tank, maybe he has been cuddled near the heater and maybe burned himself? But it seems to be spreading more down his back. I could be totally wrong here.
I've tested my water and levels are normal, I've done 1 water change since returning on Friday.
I've attached a couple of pics. Is my best course of action just to make sure water is clean? Or any other suggestions?
Tia
 

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