Prompto’s injured model is only used in Chapter 13. When you find Prompto near the end of the Chapter, he’s been restrained in some sort of device.

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You can find these contraptions around Zegnataus Keep before you get to Prompto, though all the rest of them are empty.

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He has cuts, blood, and bruises all over his face, neck, and both arms. Sadly the game never explained how he came to be injured like this. He was not injured at the end of Episode Prompto so these injuries happened between the end of Episode Prompto and the clips shown during the ending credits of Episode Prompto.

The most prominent injuries are the large cut above his left eye and the mark across his nose. It also looks like he may have taken a blow to the face due to the large red area beneath his left eye.

Both of his wrists have marks near them showing signs of struggle to get free from his restraints.

It seems Ardyn catches him after the end of Episode Prompto and locks him up in Zegnataus Keep.

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If you stay at the dormitories in Zegnataus after rescuing Prompto you will notice that while talking during the lodging scene, Prompto will wince after moving his right arm and grab it. His face will also have a pained expression on it for a few seconds afterwards