Three of my four goldfish have scales missing, every few days I find that one or two more scales have come off. One has a round patch of missing scales. The temperature and all chemical levels are fine and stable and there is no 'bullying' as far as I can tell. It doesn't look like ick and is not furry like some fungal infections might be. Some scales look as though they have lost their color and I can't tell if they are actually missing or not. I'm not sure what to treat them with at all as those different types and brands of medicines and water treatments seem daunting to me, please help!
What size tank do you have?
What is the Ammonia, Nitrite, Nitrate and PH levels and how are they tested?Do you see any red spots, black marks and are the fish acting normally?
Do you have filtration?
Have you done any water changes?