What bugs leave skins molts on your mattress?

Bed bugs do. Here are some tell tale signs that your hotel room could be infested w bedbugs. First you may notice blood smears on bedding. 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 sheets (brown- black dots). The fourth sign can occur with a heavy infestation – an odor.