My right lower lip is larger than my left lower lip
Thank you for sharing your question and photographs. It appears that your piercing resulted in the development of scar tissue to your right lower lip causing the volume asymmetry. I would recommend a procedure to reduce the scar tissue to achieve a more uniform and soft lip appearance. I hope this helps.
You probably developed scar tissue after the piercing. Sometimes a small reduction is beneficial....
It sounds like you may have some scar tissue causing your asymmetry. This could probably be reduced in the clinic under local anesthesia.
I appreciate your concern. Your best option is a conservative lip reduction reducing the larger side. The surgery can be done in the office under local anesthesia. Check out the link below to an article I wrote about the subject, it may be helpful. Be sure to consult with a board certified plastic surgeon. Good luck!