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Will the cut in my arm scar?

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I had a pretty long (7 inch) cut along my arm, that has been about 1mm deep. About a half after this and a month, I have a bright red / pink line where it had been, that is pretty lumpy. I would apply TCP to the cut while it was still open, but the scabs had been occasionally picked by me. Is this more likely to scar, and in that case, how do I prevent it?