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In many homes, a small elongated shape can appear attached to walls or ceilings, often mistaken for dust. In reality, it is the case-bearing clothes moth (Tinea pellionella), a discreet household insect that rarely represents a serious problem.
Its most striking feature appears during the larval stage: the larva builds and carries a small protective case made from materials found in its surroundings, such as hair, textile fibers, dust, sand, or plant debris. This structure serves as both shelter and food source. Its appearance varies depending on the environment, allowing it to go unnoticed as it camouflages with the surface.
It is usually found in low-traffic areas — high corners, behind furniture, or inside closets — where it moves slowly. The female lays between 35 and 50 eggs near food sources, and the larvae feed mainly on materials containing keratin, such as wool, feathers, or organic debris accumulated in dust.
It is not considered a pest and does not pose health risks. To control it, regular cleaning is sufficient: vacuuming, ventilating, organizing, and removing dust buildup interrupts its life cycle without the need for insecticides.
