HELP! Have you seen this before?!

Amy
My daughter came home from school with this "rash" on her face. At first I just thought it was from running around and being hot but after 8 hours this is what it looks like. It's only on one side of her face, no where else on her body. It is hot to the touch. She says it itches. I'm taking her to the Dr in the morning but didn't know If anyone else has seen or experienced this? What is it? Does it spread? Is it contagious?! 
Possibilities: Heat Rash and Cellulitis of the face. 
Thanks!!