Injecting a small amount of botulinum toxin intraoperatively can reduce scarring by relieving muscular tension on surgical wounds for several months, says dermatologic surgeon Yelena Frankel. "The fact that you have a scar in a location perpendicular to skin tension line leads to a constant force acting on the new scar. The muscles are kind of pulling the scar apart," she said. Studies have shown that intraoperative botulinum A and B are equally effective in minimizing the appearance of scars after Mohs surgery.

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