The answer to 'why is my flea nests' is that you likely have a flea infestation in your home. Flea nests are small clusters of flea eggs, larvae, and pupae that female fleas lay in carpets, upholstery, pet bedding, and other hidden areas. These nests provide a safe, protected environment for the flea life cycle to thrive.
Common causes of flea nests include bringing home a pet with fleas, introducing infested furniture or fabrics, or having wildlife like rodents or stray animals near your home. Symptoms of flea nests include seeing adult fleas, finding small white eggs or larvae in carpets and pet bedding, and experiencing itchy bites on your skin. To solve the problem, you'll need to thoroughly clean and treat your home, as well as treat any pets, to eliminate the entire flea population.