Hi! I m twenty years old, female, with no health problems whatsoever. For about a week now I ve been noticing a slight warm sensation just a few inches under my left knee, on the front of my leg; it usually only lasts a couple minutes and is completely random. There is no pain, swelling, or discoloration, and the area is not warm to the touch. I do occasionally experience back pain but nothing serious, it s usually menstual cycle related. The warm sensation isn t even unpleasant, but it is noticeable enough to make me wonder if anything is wrong. What do you think?