Bedbugs are a species of insect known as cimex lectularius (literallycimex is Latin for bug and lactularius is Latin for bed). There is a second common species of bedbugs known as cimex hemiptera. These are known as the tropical bedbugs, staying within 30 degrees of the equator. There are published reports, many without supporting evidence, that each of the common bedbug species has chemically different saliva. Some researchers, however, have found no difference in the reactions caused by each species.
In infestations with persistent, repeated exposures, bed bug bites may appear in crops. Also, since bed bug bites usually take three to six weeks to heal, as long as the infestation is still present, new bites may accumulate even as the older ones start to resolve. Thus, people may have various bite reactions in various stages of evolution at the same time.
Data Sources: A PubMed search was completed in Clinical Queries using the key terms bedbug, rash, bites, and infestation. The search included meta-analyses, randomized controlled trials, clinical trials, case reports, and reviews. We also searched the online databases of the Environmental Protection Agency, Centers for Disease Control and Prevention, and Jefferson Clinical Images. Lastly, we used Essential Evidence Plus. Search dates: February through June 2011.
One interesting thing is: many of my small lesions seem to be permanent. I have had some of the prominent ones for more than a year and they show no signs of shrinking or going away. I am not particularly worried about skin cancer because the permanent lesions are all very regular in appearance; skin-cancer lesions are usually irregular in shape and color.
Bedbugs may enter your home undetected through luggage, clothing, used beds and couches, and other items. Their flattened bodies make it possible for them to fit into tiny spaces, about the width of a credit card. Bedbugs do not have nests like ants or bees, but tend to live in groups in hiding places. Their initial hiding places are typically in mattresses, box springs, bed frames, and headboards where they have easy access to people to bite in the night.