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Why is my red-eared slider's shell changing color or discolored?

Updated On September 23rd, 2025

Hello, I was checking on my res turtles and I just noticed the color on their shells. Would you be able to help me out. I'm really worried I don't know what's happening.

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1 Answer

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Answered By Dr Stafford, BVetMed, MRCVS

Veterinarian

Published on September 12th, 2017

Hi there, there are a few possibilities here which I will describe, unfortunately I can't be more precise without seeing them. Worst case scenario is that this could be an infection causing shell rot, but it is likely in the early stages if so. Usually the shell will feel soft and can be smelly. Alternatively it may be discolouration caused by something in the water such as dye or certain algaes. Usually discolouration will come away when rubbed with a cloth. I would suggest heading to a good reptile vet to be in the safe side as if it is shell rot it is much easier treated early. Best of luck!

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