The red just tells you it's a male :) There's also another skink that looks just like these two, but you are a bit too south for it. Females and juveniles have a black back with a bright blue tail, seem to see them way more often than a male like this!
Either Southeastern Five-lined Skink (Plestiodon inexpectatus) or Broadhead Skink (Plestiodon laticeps). Can only tell them apart by examining the scales under the tail :)
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