Can I trim a sharp stitch at the end of my breast incision?

I'm 3 weeks post op and under my right breast I have an extremely sharp and short stitch which is digging into the underside of my breast. I don't have an appointment with my surgeon until 5 weeks time and so am considering trimming it close to the skin. My concern is that it is likely to withdraw under the skin once cut and I'm worried that if it doesn't dissolve it will be difficult for the surgeon to get to it if I cut it any shorter. Please advise. It's currently really painful.