Lip lines need various modalities for correction because they tend to be deep and are constantly stimulated by the movements of the lips. Some women experience strong and tight muscles in this area. Making those muscles softer with Botox can result in a great improvement and can prevent formation of more lines.
Laser resurfacing is very helpful in this area as well as superficial fillers. An experienced physician can add a small amount of filler to the lips making lines less visible and eliminate unsightly lipstick bleeding.