Diagnosing bed bug bites can be hard for medical professionals. We often hear of doctors assuming a variety of skin conditions before bed bugs – especially doctors who haven’t encountered patients with bed bug bites before. While there is no specific test to determine whether bites are from bed bugs there are tests that can show whether or not it’s an insect bite. This is useful for ruling out issues like eczema or allergic reactions, but not for determining that any specific insect bite is a bed bug. To be sure you’ll want to check for other signs of bed bug infestation, such as the bugs themselves, moltings, and the characteristic staining of their blood meal feces.
There are thousands of types of spiders (technically arachnids and not insects) crawling around the U.S., but only two of them–the black widow and the brown recluse–can cause serious problems, and even those are rare. Most of the time you’ll see red bumps that hurt and itch if you’re bitten by a spider. Very few people get the severe pain and cramping of a widow bite or the decaying ulcers of a recluse bite (although if you do, get medical help right away).
One bed bug will usually take more than one bite. Once a bed bug inserts its mouthparts and finds a suitable blood vessel, it will begin feeding. However, finding the right blood vessel may take more than one injection into the skin. In addition, bed bugs are very sensitive to movement by the host they are feeding on. Therefore, if a sleeping person moves, a feeding bed bug will probably withdraw its mouthparts and begin its search for a blood meal on another part of the body. It’s important to remember that the number of bites a person receives is not indicative of the number of bed bugs that feed on that person.