I have lots of ideas of how you could explain it, they'll probably be really stupid, but I like to make things up, so here goes.
You're blushing because:
It's just really hot, you just moved here from Antarctica and you're not used to the weather
You ate chilli for lunch
You have a medical condition which causes a flushed complexion
My face isn't red, what are you talking about?
You've just been jogging
You ate something you have an allergy to, now your face is red
I probably didn't help, but you never know
8O