Rash?

So we noticed a rash on Riley today.  She has more spots on her body tonight than she had this morning.  Mainly its on her belly, and sides.  A little on her back, and a few on her thighs.  I'm taking her in to the dr. in the morning, so hopefully we can find out what it is.  Flea bites? Chicken pox? Food allergy? Here are a few pics.