For the last year or so I have experienced a burning pain in the same spot on my outer right thigh. It only happens maybe once a month and the best way I can describe it is that it feels like someone has thrown acid on to a maybe 2cm square on my leg. Only lasts a couple of seconds thank goodness but the pain is enough to stop me in my tracks. I was wondering if it might be connected to exercise although there doesn't seem to be any discernible pattern to it. Any ideas?