What are the complications from not removing non absorbable braided polyester sutures for deep closure of the soft tissue in cosmetic facial surgery?

First make sure that it was not left there on purpose, as some sutures at left in the body for a specific reason. if it is intended to be taken out ask your doctor to do so as it may lead to infection or a scar or lumpy scar tissue around the wound. best thing to do is to consult a doctor as it differs case by case. In addition because it is a braid, tissue can heal between the braid and it may be harder to remove if it is not intended to be left in and that will cause more scar tissue to form.