Small cracks and chips can usually be left to heal on their own. This doesn't sound like the case here and I agree that a vet visit is essential. Keep him ultra clean, in a sterile type enclosure until the vet has further advice. The tissue underneath should be kept moist, but this isn't really much of a problem for aquatics. If you find he's basking a tonne, then perhaps put on some polysporin ointment. It'll keep the tissue moist, and also help prevent infection.

Good luck,

Ian

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