When bed bugs bite, you may notice bloodstains on sheets and clothing. The bloodstains come from the excrement left behind by bed bugs. They may also leave behind a musty or moldy odor. A close inspection of seams around a mattress can reveal black and yellow spots, as well as rusty spots. The spots are the excrement of bed bugs and are caused by the insects’ shed skins, egg shells, and nymphs.
Adult bed bugs are brown all over, but they will never turn white. You might have noticed a bug crawling around your bedroom recently. You’ve probably noticed a round red spot on its abdomen. After the feeding, the bugs will start to digest the blood and shed their skin. When the bugs reach the adult stage, they will be brown and look like a worm.
When bedbugs are young, they are translucent and white, but they turn rusty red when they feed. This is because bedbugs feed off of human blood to build their skin. They prefer undisturbed places to hide, which is why they are often found in hospitals, mass transit, and hotels.
Adult bedbugs feed once every week to survive. However, if their environment does not support their feeding, they can survive for longer periods without feeding. Depending on the number of adults, the duration between feedings can vary from a week to a year.