Do bed bugs leave skin or shells behind?

Yes - exoskeleton. Here are some tell tale signs that your bites are being caused by bedbugs. First you may notice blood smears on your bedding (yes this is your blood). Remember that the blood smears usually turn black over time. Second you may see amber colored “shells” which occurs when the bed bug sheds it's exoskeleton. A third sign of infestation is bug feces on your sheets (brown- black dots). The fourth >.