Thank you for your response
I just don't use fipronil. My puppy hasn't had a medication for fleas yet because it's her first summer. She's just 6 months old.
I know for sure it's not fleas because I don't see anything on her skin that looks like it and also the vet checked and he said she doesn't have any.
Also my puppy never goes outside, she's always inside the house.
It's really difficult to identify the cause of the problem..
The symptoms are exactly the same as the pictures
JoselleandLola put above.
p.s. excuse my english, I'm greek