Suggest Remedy For A Leg Injury Caused While Playing Rugby

hi there, i suffered from a quite severe dead leg type injury playing rugby possibly getting on for over 4 years ago now, at the timer the injury was very painful and i was unable to walk on the leg properly for over a week. i just put it down to a bad dead leg an the pain would eventually go away. i now have quite a wide circle of what feels like damaged muscle on the left side of my thigh about 2 cm diameter and getting deeper towards the centre it almost feels like a hole, it is not excruciating when going about my normal day but i am aware of it and as i still play contact sports whenever I receive an impact their the pain is excruciating, i feel i may have left it to late to really do anything about it now but any advice would be much appreciated.