What would happen if I cut the stitches in my belly button?

Hello and thank you for your question. It is possible that you have sutures that remain after abdominoplasty if the surgeon who performed your procedure used suture material that was permanent and not reabsorbable. Some surgeons use these permanent sutures to perform the plication of the rectus abdominis musculature. Personally, I avoid using permanent suture to stay away from the problem you are experiencing. 
Nonetheless, never try to remove sutures at home. You should definitely go and have a consultation with a fully trained plastic and reconstructive surgeon to determine what your options are when it comes to removal of this suture material.
All the best!
Alex Zuriarrain, MD, Plastic Surgery

First of all, I would recommend consulting with your original plastic surgeon. Second of all, if he/she is not accessible, I would recommend consulting with a board certified plastic surgeon to further evaluate this area. I would not recommend doing any procedures on yourself.