What Does Secretion And Pulsating Feeling In Thigh Imply?

I've noticed a strange pulsating feeling in my left thigh right above my knee. It isn't painful, but it is strange in that there is no regular rhythm to it. It comes and goes throughout the day, sometimes it's pretty active other times not. I would describe it almost like a jello type substance being squeezed through my thigh. Sometime I can see the actual pulsating.