Hi, thanks for writing to HCM. The description you have given suggests that you have lumbar disc prolapse
with pressure over the exiting nerve
roots resulting in pain and burning sensation down the leg. If the nerve roots gets too much compressed by the intervertebral disc
, then the muscles supplied by that nerve will get atrophied resulting in indentation or trough like appearence. I suggest you to immediately undergo MRI scan for your lumbar spine
so as to know the exact underlying cause and get it treated accordingly. Hope this helps.