Sand fleas maybe? I was bitten to shreds on a Caribbean island (lots of feral cats too) and it lasted for weeks. Cody had a flea once, gotten from the vet's office, so far, Klo, zero. I bite the bullet and use Frontline. Hate the smell and effort it takes to squirt in ON her. If the world came to an end, only fleas, ticks and cockroaches would survive, I'll bet. Gessh, and you have 3 to worry about. I hope you solve the problem quickly