<s>[INST] Dear doctor,I have a slight tingling throughout my right leg and there is an area of skin 4 by 5 inches or so, that feels senseless, at the top of my thigh on the back (top of hamstring). There is no pain or functional impairment.I did come back from a long airplane flight 3 days ago, I did wear pressure-socks up to the knee. Also, i did do some physical labor 2 weeks ago that still bothers my lower back a bit every now and then, like a brief pain shoots through.Not sure if these details are possibly related.What do you advise? Thank you in advance,Chris [/INST] Hi, Chris,welcome to Chat Doctor forum.  You have tingling in the right thigh, after a long air journey. You had hard work, 2 weeks ago, and the back is still paining.  Hi it appears that you have lumbar spondylosis, due to long journey there was a pressure on the sensory nerves coming out from the spinal cord.  You may need to have M.R.I. of the spine for diagnosis, so I advise you to consult an orthopedic surgeon for diagnosis and treatment.  Wishing for a quick and complete recovery. Thank you. </s>