The diagnosis of a bedbug bite can sometimes be difficult, as bedbug bites may appear similar to the bites of other insects. A health care professional will ask detailed questions and perform a physical exam, focusing on the skin. Other organ systems will also be examined to assess for any signs of an allergic reaction or for signs of infection. No blood tests or imaging studies will be necessary. If someone is able to bring in a specimen of the insect that may have bitten them, this can be helpful in making the diagnosis.
Heat treatment: Heat of 120 F for two hours will kill bedbugs. Wash items in hot water (120 F or above). This may not be enough, though, so it's recommended that you place items in a clothes dryer on hot heat for at least 30 minutes. In a hot climate, you can bag items in a black plastic bag and leave them in direct sunlight for 24 hours. For travel or home use, there are portable heating units that can be used for clothing and luggage. A garment steamer can also be used on some items, such as luggage.
Check the mattress throughly, paying close attention to seams and tufts along the edges. Flip the mattress over and inspect the bottom carefully as well. Pay particular attention to any rips in the fabric. View the fabric on the bottom of the box spring and shine a flash light to verify that bed bugs have not penetrated the interior of the box spring.
The exact causes of this resurgence remain unclear; it is variously ascribed to greater foreign travel, increased immigration from the developing world to the developed world, more frequent exchange of second-hand furnishings among homes, a greater focus on control of other pests, resulting in neglect of bed bug countermeasures, and increasing resistance to pesticides. Declines in household cockroach populations that have resulted from the use of insecticides effective against this major bed bug predator have aided the bed bugs' resurgence, as have bans on DDT and other potent pesticides.[medical citation needed]
Blood spots found on one’s sheets, bites and the presence of bed bug feces and cast skins are some of the indications of a bed bug infestation. Bites are commonly found on the parts of the body that are more likely to be exposed to bed bugs during sleep – the hands, neck, face, shoulders, legs and arms. While not always the case, bed bug bites are often grouped together in a small area and at times may occur in a line or a zigzag pattern. Bites normally look like small, flat or raised areas that may become inflamed, itchy, red or blistered. Bed bug bite reactions don’t always appear immediately after you’re bitten and may take a few days to begin causing symptoms. However, not everyone reacts to bed bug bites in the same manner.