Thin Uneven Lips Due to Childhood Accident. Is There Some Surgery Available to Fix This? (photo)

When I was five years old I fell from a tree and split my face open. The accident caused a scar that runs all the way through my whole lip to my chin. My lips were I guess already thin but the scar on the left side has always made them uneven. Is there a surgery that could correct this and in the process make them a bit fuller? I don't expect Angelina Joile lips, but just some normal looking lips. I would appreciate any help you can offer me . *(Posted 2 images of my lips, one smiling/One relaxed)