The answer to 'why is my flea droppings' is that you likely have a flea infestation in your home. Flea droppings, also known as flea dirt, are a common sign of a flea problem. Flea dirt is made up of dried blood that fleas have consumed from your pets or yourself.
Fleas can quickly multiply and spread throughout your home, especially if you have pets. Common causes of flea infestations include pets bringing fleas inside, fleas in the yard or neighborhood, and lack of regular pest control. Symptoms include seeing fleas, flea dirt, and pets scratching excessively.