About 7 months ago I started noticing a pins and needle/burning feeling in my left leg, on the inside of the knee and calf, sometimes on the outside of the knee/various places on calf. This progressed to a feeling of intense pressure behind the knee. There was also a feeling, for instance when taking a shower, that I could 'feel' the water hit the back of my knee in a different way than the rest of my leg. I could feel my pants legs rubbing on it as well. I had a MRI done of my brain, lumbar spine and an ultrasound done on the leg, and nothing was found. My doctor supposed perhaps it was a baker's cyst, but no evidence of that was found. Eventually, most of the symptoms subsided, except for the exaggerated sensations I feel when water or my pants come in contact with the back of my knee. Lately, this has gotten much more pronounced, and it seems as if I can always feel pressure or some sort of exaggerated sensation behind the knee. Doctors are at a loss. I have had no accident or injury. I do think my left leg is functionally longer, due to scoliosis, but I have had that for many years. Any idea?