Experienced pest management professionals (PMPs) know that fecal matter or fecal stains, the “calling cards” after a bloodmeal, are a clear indication of a bed bug infestation. In fact, they are one of the telltale signs searched for when conducting a bed bug inspection. For the most part, we recognize bed bug fecal stains as dark spots that may appear on a mattress, box spring, bed frame or other areas.

But the porosity of the substrate upon which the fecal matter is deposited may affect the appearance of the fecal stain.

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