Identify a sign of a bed bug infestation.

Identifying a bed bug infestation often involves recognizing various signs that indicate their presence. Small red or brown stains on sheets are a common indicator of bed bugs. These stains typically result from bed bugs feeding on blood. After a meal, they may excrete some of the blood, leaving these characteristic spots on bedding or mattresses. This is a key sign that signifies not only their feeding behavior but also their presence in the living area.

In contrast, other signs such as large holes in bedding are generally not associated with bed bug infestations but may indicate damage from other pests or wear and tear. A strong, musty odor in the room could possibly indicate a severe infestation, but it is not as definitive as finding the stains. Similarly, bed bugs are primarily nocturnal and are less likely to be seen during the daytime; therefore, visible insects during the day are unlikely to be a reliable indicator of a bed bug problem. Recognizing small red or brown stains provides crucial evidence for confirming the existence of these pests.