Warm sensation on inner thigh..

For about a week now I have been having a periodic warm sensation on my left thigh just above my knee.  The area is about the size of a softball. It comes and goes. Lasts about 30 seconds to a couple minutes. It doesn't matter if I am sitting or standing. It feels like someone is peeing on my leg in that spot. I have had a cold/flu virus for about 3 weeks now.  I am a 34 year old female.  Any ideas on what my be causing this?