It looks fine to me all its done is rubbed it off digging under a rock or something which is why I don't have rocks in my pens now because a couple of years ago I had one do exactly the same.
As said above by Lynn I just bathed mine with hibiscrub and it's fine.
The shell probably won't grow back and I have also carefully trimmed off any loose bits of shell to stop it getting caught on anything and making it worce.
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