Looks Like Sunburn on Humans Help Please

[canjcdiii]

I lost a fish yesterday with looks to be a scale problem. To give you the best example of what it looks like is described as it looks like dead skin on a human being after a sunburn. I was checking my PH levels and Amonia levels earlier and did my daily check of the fish and discovered it on another fish. I have noticed this fish not eating as well. Can anyone give me some help on this on how to treat it Of course its the weekend so no fish store is open around here. Thanks

[Lisachromis]

Can you give us more info?

What fish died?
What fish is sick? (How long?)
What size tank?
How often/much you change your water?
Water parameters?