Cutaneous larva migrans, also known as creeping eruption, is a common parasitic infestation of the skin caused by percutaneous penetration and migration by dog and cat hookworms. The most common organisms are Ancylostoma braziliense and Ancylostoma caninum, but other nematodes may cause this condition as well. These organisms are not capable of completing their life cycles in human hosts, so they migrate through the skin and cause an inflammatory response that is usually quite pruritic.