When trying to find bed bug activity you should inspect for the following things.
1. Blood Spots or Streaks – Left on sheets are easy to spot. These are spots where a bed bug has been crushed or from the host after being bitten.
2. Fecal Spots – Bed bugs will “go” wherever they please. These spots look like little black dots left by a pen.
3. Shed Skins – Bed bugs go through several stages during their life-cycle. They leave behind a skin husk when they do.
4. Bed bug – If you are careful and look in the right locations, you may find live bed bugs. Check creases in sheets, cracks & crevices in bed frame, between mattress and box springs. They are no bigger than an apple seed usually.