Bed bugs (Hemiptera)
During the day, bed bugs hide in crevices in walls and furniture; at night they can travel considerable distances to reach a sleeping person. Burning wheals, turning into firm papules, occur in groups wherever the crawling bugs have easy access to the skin, the face, neck and hands being the most common sites. Treatment should be based on the application of insecticides to walls and furniture likely to be har-bouring the bugs.
The larvae of several species of fly develop only if deposited in living flesh; humans are one of several possible hosts. The skin lesions look like boils, but movement may be detected within them. The diagnosis is proved by incising the nodule and extracting the larva.