You can see your surgeon about this. It's possible that you have adhesions that are making the healing process impossible. They may be able to revise the scar.

i am no expert but i had some deep scar tissue on my big toe after a surgery. i think the therapist used an ultrasound device and worked on it.
ask the doctor what steps to take with a physical therapist. there might be
a solution that wouldn't require going back under the knife..