Kinda looks like a tooth… i know these guys shed them fairly often. Might have ingested one of its own. If thats the case, gotta pull it through with tweezers and treat with the betadine as suggested before. And yes, just regular betadine u can find at the drug store. Just gotta hold the guy down and dab or squirt some on em. Might take a few treatments to keep it clean. He should heal up quick once thats removed tho.
Interesting you say that because it looks like it's top front tooth is missing!