Red Blood Stains.

The red blood spots are produced when bed bugs are inadvertently crushed, usually by a human movement.

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The Black Markings caused by the Feces are the most prominent tell tale sign. The Red Spots caused by the crushing of a Bed Bug are less obvious.

The Blood Spots on a boxspring Blood Spots: These red to dark red spots are a result of a bed bug having been crushed by human movements in the bed. The shape of the blood spots is like that of a smudge. Sometimes, there could be somewhat of a streak too.

The dot like black excrements are the first tell-tale sign of bed bug presence. In the fibres of fabric articles, this liquid bursts like ink. On non absorbing surfaces such as finished wood, it would dry up in a dot like shape.

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The Black dot like marks are Bed Bug feces. The bed bug feces remain like an extruding dot when the bed bugs excrete on a non absorbing surface like that of wood or plastic. However, when bed bugs excrete on mattress or box spring fabric, often this black liquid substance runs into the fibers of the fabric.

The Blood Spots on a boxspring and Black Feces Here is the same box-spring from another angle.

Please, do keep in mind that are many black marks of the bed bug feces for every one blood spot. However, the black marks of the bed bug excretions are a bit harder to find because of their size and location.