I and a colleague reviewed the picture and we have come to the conclusion that this is not an abnormal condition. It looks like the scutes are getting ready to shed or have already shed leaving the color difference. I think it is safe to say that the turtle will be fine. When you had said red I was concerned about septicemia, but the shell looks to be in fine shape. I do want to give you a better care sheet as the diet and supplements need improvements. The diet should be 50% leafy greens or aquatic plants, 25% pellets and 25% cooked meats or live prey ie :snails, worms or crickets. Calcium is very important and a cuttle bone works wonders for these turtles. The UVB light should be changed every 6 months for optimum help to prevent MBD. Joan
A soft tooth brush can be used on the shell to help with shedding scutes. I do recommend a Herp vet visit before brumation time to be sure that they have a good sleep without loosing weight or any problems. Joan
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