Hmmm, not sure about than one Elena! I guess it could be an allergy, yes. Possibly food, or some chemical of some sort. Have you bathed and shampooed her recently? Or washed any of her clothing in washing powder/fabric conditioner?
The other thing that crosses my mind is that they could just be adelencent spots, you know like teengaers get. Ellie had a spot on each ear like the ones Pixie has a while back. I just asumed since they weren't irritating or hurting her that they were just spots. They disapeared after a few days.
Not sure though, sorry I cant be of more help! But I know others will chip in with their opinions soon!