The placement of the the product will depend upon what you're trying to achieve with the treatment. The outer portion of the lips can be filled for definition and volume. It can also help with symmetry. The pink part is injected when fullness is desired. Consult with your injector to determine the best treatment plan for you.
It depends on if someone is looking for more fullness (in body of the lips) or is looking to improve more symmetry (in the border of the lip). These fillers, (Restylane, Juvederm) are good to create a symmetrical and full lip. Implants or fat are alternative options. See an expert for a formal evaluation. Best, Dr. Emer