Indicators of your property being infested with bed bugs include the left-behind skins of these insects, which may be strewn about furniture, flooring, and otherwise. You may also notice small, reddish-black spots on materials such as bedding or your mattress itself. This is fecal matter. Lastly, the most obvious giveaway is the presence of any live bed bugs or their eggs (these are up to one-eighth of an inch in size).