Advice on lip scar from dog bite? 4 month old wound. (photos)

End of February my dog bit my lip, sent to emerg and recieved plastic surgery stitches. The bite did not go through the internal lip but made a flap-like cut on the bottom external lip. I have been massaging daily but the bump does not leave and is noticeable when I smile. Is there any way I will be able to have my old smile back? Thanks for your time, Stephanie