Poor baby! I had a keeshond who was so allergic to fleas that she would pull the hair off in a spot that size. I hope you can get her to the vet soon. The vet prescribed prednisone - and some steroid cream (kenalog) which apparently was super soothing because she let me put it on without fussing. When we lived in Sacramento I constantly fought fleas - this was before they had all the marvelous treatments available now - so once a month the dogs would go to the groomer's for the day for a flea dip/bath - while they were away, I'd flea bomb the house, and spray the yard GOOD with yard and kennel spray. It was a constant battle. After we moved to eastern Washington she was able to live out the remainder of her life flea free. I hope your baby is all right. That looks miserable.