Burning sensation in my thigh

Here is My Question:
For the last year and a half I have felt a burning sensation in my right outer thigh intermittently that lasts for 15-20 seconds and goes away with little movement. It does not occur every day, and happens only for a particular standing position for more than 10 minutes. It subsides automatically when I sit down. I did the contrast spinal and brain MRI which came back normal, The result of the evoked potential test and nerve conduction test also came back negative. I am still having doubts of having MS, what's your thought on this?  

Answer:
The outer thigh is an area that transmits sensations to the brain through a peripheral sensory only nerve branch called the lateral femoral cutaneous nerve. This nerve is often compressed under the inguinal ligament or damaged by diabetes. There are of course many other reasons this nerve could be irritated or damaged, but these are the most common reasons. A neurologist would not normally ascribe your symptoms to a problem in the central nervous system- such as multiple sclerosis- unless you had other symptoms or findings on examination that pointed to a problem in the central nervous system. A problem involving the lateral femoral cutaneous nerve could be confirmed with nerve conduction studies, but this is usually a clinical diagnosis. It is typically called meralgia paresthetica.

Revere P (Rip) Kinkel, MDProfessor of Clinical Neurosciences
Director of the Multiple Sclerosis Program
Clinical Neurosciences Director
University of California San Diego