There is a condition called prune belly syndrome that would not apply to you and cannot be surgically fixed. Any abdominal wall laxity can be corrected by an abdominoplasty. If the prominence is caused by excess intraperitoneal fat only weight loss will flatten the abdomen.
Umbilical hernias that are small are commonly encountered during an abdominoplasty. There easily fixed sutures. Introduction of mesh means the foreign body that may be beneficial if there is a high risk for recurrence.