Bed bugs casings and shells refer to the remaining exoskeleton after bed bugs shed their skin. The shells or casing often look like an empty bed bug. The terms shells and casings are often used interchangeably.

Bed bug shells, or casings, are the insect's exoskeleton. A nymph will outgrow and shed its shell during each stage of its life cycle until it reaches adulthood. Bed bug casings are usually translucent and vary in size depending on how old the nymph is.

Bed bug casings, also known as bed bug shells, are the exoskeletons that these insects shed throughout their lifecycle. When you find these casings, it’s a sign that you may be dealing with a bed bug infestation.

Bed bug casings: As bed bugs grow and develop, they shed their outer skin or exoskeleton, leaving behind translucent shells which can be found near their hiding places. These casings are a strong indication of an active infestation.