Removing Skin and Muscle for Upper Lip Lift, or Just Skin?

Thank you for your question. The Lip Lift procedure is performed to accentuate the size and/or shape of the upper lip by removing skin from the region just underneath the nose. As the distance is decreased between the nose and the lip, the red lip is 'lifted'. In appropriate individuals, shortening this distance may impart or restore a more favorable balance to lips and face.
In most cases, during a subnasal lip lift, the skin alone is removed and the muscle is not disturbed. Involvement of the muscle may increase the risks that one experiences the side effects that you describe.

Good day! The lip lift procedure starts with marking the length of the lip and the width of the skin to be removed beneath the nose. Most of the times only the skin is removed,  but sometimes the muscle is also tucked to help shorten the distance between the lips and the base of the nose. The small incision is placed at the base of the nose which follows the natural lines so that it becomes nearly invisible with time. Find a board-certified plastic surgeon that has extensive experience with this procedure and discuss realistic goals and expectations. Best of luck! #RealSelf100

Only the skin is removed with the lip lift.  Removing muscle would cause movement problems.