Cat fleas, about 1 to 2 mm in length, are parasites that live in a cat's fur, and they have an insatiable appetite for blood. If left untreated, an infected cat or kitten can suffer anemia. The cat fleas' ability to jump enables them to leap from one cat to another, and even on to a human.
Bites from the fleas can be unbearable and very itchy. If a person is bitten, the bite marks usually appear on his/her legs near the ankle regions.