Bleeding and infection are listed as risks of every surgery where an incision is made and this procedure is no different. Dr. Wallin uses much caution to avoid the biggest concern, damage or stretching to the nerve that moves the upper lip. Swelling is present in 100% of patients after surgery and this can persist for weeks in certain patients. Dr. Wallin operates close to the duct that drains the parotid gland and damage to this important structure can result in saliva issues with drainage, although this is extremely rare.