Adults are around 5mm long. Bedbugs can hide in many places, including on bed frames, mattresses, clothing, furniture, behind pictures and under loose wallpaper. bites – often on areas exposed while sleeping, like the face, neck and arms. spots of blood on your bedding – from the bites or from squashing a bedbug. Bedbug bites can be red and. Widow and Recluse bites are primarily diagnosed based on clinical signs that may take hours (or even days) to develop. Intense pain and lesions around the bite center are two of the most telling signs that your dog was poisoned. Seizures, muscle stiffness, lethargy, paralysis, vomiting, and fever are also big indicators.