scratching

I recently noticed the girls scratching more especially today and so checked Florries fur, I noticed a brown fleck and upon further investigation it was wriggling about and soon found another one. I am so creeped out but even more worried how I am going to make the girls feel better and get rid...

Mines seem to scratch themselves at -least- once or twice every five to ten minutes. Sometimes even more. Is this normal? I have taken them to the vet and he even checked them for parasites and couldn't find anything. I've been waiting for other symptoms such as loss of appetite, not...