Wow! What type of enclosure is he in? What are your husbandry numbers like? It does look like a injury of some type. Are you feeding live prey? Maybe a scratch from the claws of the rat or mouse while it was struggling? Well, after looking more closely I think that is the normal extra flap of skin that is on all pythons. It becomes visible during swallowing when the jaws expand and move to accept the prey item.
Stay in peace and not pieces.
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