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Barry had a tendency for long sleeves. He had ever since the day that he had been struck by lightning and gained his powers. It was the only way to hide the lichtenberg patterns that scarred him from his shoulder all to most of the way down his arm. They were the only scars that stuck around, the Speedforce healing factor making the rest heal much faster than for an average human to the point he could no longer have scars. He wasn't ashamed of the scars, but there were always more questions than he wanted when they were seen.