That is definately a prolapse and you shoud seek the help of a good reptile vet.

That's where a part of the bowel is forced outside of the body for some reason

>>Hi! My sulcata tortoise (which I believe is a female, but am not 100% on) has a large red bulge coming out of its back end. I am not sure what this could be, please help! This doesn't look like anything normal!
>>Thanks!
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>>Image
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Ed @ Tortoise Keepers
Trying to keep the fun in Chelonian care