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How do I know if the wound healed/closed the wrong way?

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I cut pretty bad earlier this month (october 4). The cut was dissociated (I.e. Open/gash) it's about 7cm long and 0.5inches deep. I didn't see the doctor for that... It took me about a week and a half to have it stop bleeding. It had redness all around it... I only cleaned it with warm water, and covered it with paper towel (that what was available for me). It has closed now, yet, it hurts as hell whenever I tried to stretch my arm (the cut starts from the beginning of the wrist and goes all the way to the central part of my arm). Do you think the wound has healed/closed the wrong way?