It may be possible that you may have a ganglion cyst in the wrist that shows when you flex your hand. I would recommend that you see a hand specialist to determine the exact problem and treatment.
If that gives some relief after 6 weeks, another injection can be given. If there is no relief from the injection, a simple surgical release can be done. This takes about 20 minutes and is done under local anesthetic.
That should help reduce the scars in time.