A male soccer player was struck in the head with a soccer ball. Players state that he was dazed for several seconds following the impact and then asked the same questions over and over. Presently, he is conscious and oriented to person, but confused about place and time. He also has a reddened area to the side of his head and face. As you proceed with your assessment, his memory continues to improve. Based on these findings, the EMT should suspect which type of injury?