Bed bugs can leave a variety of brown stains, from blotches of blood to a yellowish brown stain from their fecal waste. These stains are the result of the insects’ digestion of human blood. The stains are often concentrated near the foot of the bed and in the pillowcase. They also leave behind a foul odor.
Bed bugs leave these marks on a variety of surfaces, including bed linens, bed sheets, and mattresses. These stains are caused by the insects’ excrement, a mixture of blood and enzymes. These stains are small and can appear dot-shaped or splotchy. Over time, they will spread to cover a larger area and fade to a lighter color.
A fully-grown bed bug can leave six blood stains in fourteen days. The bigger the infestation, the more stains you’ll find. Also, a single bed bug can leave one fecal stain a day. These stains may also be found in baseboards and along the edge of the carpet.
A bed bug’s blood stains on a carpet can be hidden with a dark-colored carpet. Apply a paste of baking soda and water to the stained area with a tissue, and let it dry. Bed bugs often crawl into houses due to outside weather. This is why they’re likely to nest in walls and baseboards.