The answer to 'why is my flea damage' is that you likely have a flea infestation in your home. Fleas are small, wingless insects that feed on the blood of animals, including pets and humans. They can cause damage to your home and belongings, as well as health issues for you and your pets.
Common symptoms of a flea infestation include seeing the fleas themselves, finding flea dirt (their droppings) on your pets or in your home, and experiencing itchy bites on your skin. Fleas can also lay eggs in carpets, upholstery, and other fabric surfaces, which can lead to an ongoing problem if not properly addressed.