What causes blood spots on sheets? Bed bug-related blood stains usually happen when you inadvertently crush the bugs feeding on you while sleeping. Bed bugs feed continuously for up to an hour, until their bodies are fully engorged with blood.
Do blood spots on sheets mean bed bugs? However, you should still give the top of your mattress a good once over to look for black spots or blood stains. These little black spots are sometimes smeared making them look almost like pencil marks. They are actually bed bug droppings which is pretty gross. Now it’s time to get to the crucial areas.
How big are blood spots from bed bugs? These small, dark spots resemble an ink dot from the tip of a pen or marker. Their average size is about 2 to 4 times larger than a period at the end of this sentence. Fecal marks come from bed bug droppings, which consist of digested human blood.
What bugs leave blood stains on sheets? When bed bugs infest, they will leave blood stains on sheets, pillowcases, blankets, mattresses, box springs, furniture, carpets, molding, and more. These stains may be red but, most of the time, they appear tan or brown.