Bedbugs are about 4 to 5 millimeters in length and can live for up to a year without feeding. Cleanliness is usually sufficient to control bedbugs, but in larger numbers, they may be killed with appropriate insecticides. This is a bot fly bite on the hand. The larvae inside should be removed surgically. The bite appears similar to a boil.
Fleas are blood-feeding insects.
Pain and itching results from an allergic reaction to the materials that the fleas inject into the skin at the time of the bite. It is located on the wrist. Occasionally a central depression, or punctum, can be seen. This is a photograph of Pediculus humanus var. Head lice have become an increasing problem in schools and day care centers.