I have permalips pain after son accidentally hit me. How would I know if the implant is displaced?

Hello. I had permalip implants in 2017. During sleep my 5 year old son accidentally hit me in the lips , mostly my lower lip. Ever since than I have had pain in my lower lip on the left side. No bruising or bumps. My plastic surgeon said it looks fine and not displaced. How would I know if the implant is displaced? What could cause this pain? I have had slight pain once in awhile in this area ever since surgery but it has been hurting ever since a week ago. Thank yoi