I found a beautiful long haired cat in January. I had it checked by the vet at that time and she did not have fleas. I have kept her indoors the entire time. Recently I have noticed where she lays small things that have fallen off of her. They look like sesame seeds. They seem to be hard but can crumble with my fingers. I have looked on her fur, and have not found anything to indicate fleas. She does not scratch or dig. I have had cats all my life and have never had a cat shed small seed like things. Is this flea eggs? Do I have a problem?