Lip lift permanent stitches left under the skin?

I had lip lift scar revision, surgeon left a long permanent stitch (the stitch across the wound) under my skin, there was a end of the stitch above the skin, which allows the surgeon pull the stitch out , but it shrink back in my skin, so right now u look my incision site seems no problem, but I know there's a long stitch underlying my skin, so my questions are : will this stitch come out on its own, how long does it take? Does this stitch cause any local reaction ( infection) lead to a scar?

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