This is bed bug fecal left by the bed bug on the way to or from a blood meal. It smears like charcoal when lightly brushed with the fingertip and retains the dark colour when a damp cotton swab is swiped across their surface.
Evidence of bed bug "spotting" is much more commonly seen as dark/black stains or smears from the digested blood that is excreted as a dark liquid Shed skins (exoskeletons) of immature bugs as they develop from one stage to the next.
Bed Bug Blood Smears When you see tiny rust-colored smears on your bedding, it's not slam-dunk-certain that it's been caused by a bed bug, but it does give you probable cause to lead a full-scale search of your bedroom to see if you can spot any of these pesky bugs.
Other Signs of Bed Bug Bites. The bites themselves aren't going to provide clear-cut evidence that you have bed bugs at home. Here are some other signs to watch out for. Reddish Stains or Smears: you may notice reddish stains on your bed sheet or mattress. This could be caused by bed bugs getting crushed as you move around in your sleep.
What about the saliva smear test? Do bed bug fecal spots always smear if they are recent and on furniture? Can carpet beetle excrement appear similar? I was just reading online about carpet beetle frass and I now think I found some frass in the same area
BLOOD SMEAR BASICS JENNIFER A. NEEL, DVM, DACVP (CLINICAL) ASSOCIATE PROFESSOR, CLINICAL PATHOLOGY NC STATE COLLEGE OF VETERINARY MEDICINE RALEIGH, NC, 27607 Introduction Although tremendous advances have been made in the field of point-of-care hematology analyzers, examination of a well prepared, well stained blood smear remains the cornerstone of veterinary