Bed bugs are insects from the genus Cimex that feed on human blood, usually at night. Their bites can result in a number of health impacts including skin rashes, psychological effects, and allergic symptoms. Bed bug bites may lead to skin changes ranging from invisible to small areas of redness to prominent blisters. Symptoms may take between minutes to days to appear and itchiness is generally present. Some individuals may feel tired or have a fever. Typically, uncovered areas of the body are affected and often three bites occur in a row. Bed bugs bites are not known to transmit any infectious disease. Complications may rarely include areas of dead skin or vasculitis.