I have had this before, but cannot seem to find out from drs, or on line research what this symptom is. Only get it on one side (right). It just happens out of the blue and will stick around for a few days and then go. It is always on outer leg/thigh and sometimes travels down to calf. there's no rash or redness, but it feels like sunburn - sort of - very sensitive to touch. the only other thing is it happens when I am low physically. anyone else get this, and any ideas what it is.