That doesn't look good at all, but I agree with the others - it needs to come off. Maybe you can try soaking the baby in warm water (in a container it can't climb out of). I think Stells posted quite a while back on how to use dental floss to separate twin baby tortoises. I'd certainly try that and get rid of that ugly black blob - the sooner the better.
You're so lucky to have Chaco tortoises and even luckier that they breed and have viable offspring. Chaco are very rare here in my area. I'd LOVE to have some.
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Yvonne
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