The most common sign of a bedbug infestation is waking up with itchy bites, especially if the bed or furniture was purchased secondhand. Unlike flea bites, bedbug bites don't have a red spot in the center. After noticing itchy bites or welts, it's important to identify if the problem is in fact bedbugs, so proper treatment can begin.
Crushed bedbugs often leave behind a tiny bloodstain. Check the sheets, blankets, bedding, mattresses, box springs and any surrounding areas for tiny reddish spots. Bedbugs also leave behind tiny dark spots from their excrement, so check the walls, clothing, bedding and sheets for any tiny black spots. Using a magnifying glass may be helpful, as these spots are going to be difficult to detect with the naked eye. Look for tiny white eggs and shed exoskeletons as well. Some bedbug infestations may cause an offensive, musty odor.
If any of these signs are found, wash all clothing, bedding, curtains and linens in very hot water, and then put them in the dryer at the highest possible setting. Scrub all mattress seams with a stiff brush to remove bedbugs and their eggs, and then vacuum the mattress and surrounding areas thoroughly. Place the vacuum bag in a sealed plastic bag, and then dispose of it in a secure location away from residential or commercial areas. Contact a pest control professional if the infestation persists.