Bed Bug Cast Skin (Exuviae)

Indoor environments, particularly in and around sleeping areas such as mattresses, box springs, crevices in bed frames, and furniture upholstery.

Bed bugs themselves feed on human blood; these cast skins do not eat but are waste products of growth.

Bed bugs go through 5 nymphal stages before adulthood, shedding their exoskeleton at each stage. These skins accumulate in harborage areas, often alongside fecal spotting and eggs.

While the skins themselves pose no direct risk, their presence is a definitive sign of an active bed bug infestation, which poses significant nuisance, psychological distress, and potential allergic reactions from bites.