Burning nerve pain on right side of incision, 3 weeks post-op. Is this permanent? (photo)

In the course of a TT, sensory nerves may be divided (cut), stretched, entangled with sutures used for repair.  Initially, sensory impulses will cease (i.e. the area will be numb) however anywhere between 10-14 days, post-op the nerve axon (stump) puts out multiple "feelers" and reinnervation commences.  The subsequent sensation can have various manifestations from intermittent "burning", sensation of "ants crawling", itchiness or any other aberrant pathway.  Discuss this with your PS, ask about any bio feed back techniques, short-term localization and nerve block therapy and expect it will settle down.

The pain you are describing is likely due to nerve irritation.  Nerve pain can occur after surgery and can sometimes be difficult to manage.  Luckily, it is usually temporary and should get better with time.  Try to be patient and contact your surgeon if anything worsens.