I wonder too if it will come off. In one photo it looks like it might just pop off if you used a fingernail on it. It might wash off with enough soaks in fresh water too.
I'd keep an eye on it because if dirt could get under a scute so could infection.
I wouldn't worry too much right now though, it doesn't look like anything serious to me it's just that I'd want to keep an eye on it to see if it increases or diminishes.

I'm cautious about things but on the other hand the first year we had our tortoise the vet we used then was very worried about her black colored beak.. until I told him it's just recently turned black because of her grazing and eating the gooey cactus. That black on her beak did wash off with enough soaks.
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PHRatz

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• What is this black crud? - kasie, Wed Jul 12 12:59:51 2006
• RE: What is this black crud? - Rouen, Thu Jul 13 06:49:03 2006
• RE: What is this black crud? - PHRatz, Thu Jul 13 11:00:34 2006
• RE: What is this black crud? - kasie, Thu Jul 13 13:57:33 2006
• RE: What is this black crud? - golfdiva, Fri Jul 14 21:23:21 2006
• RE: What is this black crud? - golfdiva, Fri Jul 14 21:25:45 2006
• RE: What is this black crud? - golfdiva, Fri Jul 14 21:27:45 2006
• RE: What is this black crud? - PHRatz, Sat Jul 15 10:55:44 2006
• RE: What is this black crud? - PHRatz, Sat Jul 15 10:59:34 2006