Hi, You have severe pain
on outer side of left leg.It appears to be the pressure on the nerve running on lateral side(fibular nerve.) of the left leg. due to pressure on the sciatic nerve
It should be taken care of, consult a surgeon for diagnosis and treatment. you may need to have an MRI, besides other routine tests for confirmation.
For my patients i prescribe neurotropic injections, antiinflamatory drugs for temporary relief. Thank you.