Cutaneous larva migrans is caused principally by larvae of the dog and cat hookworms, Ancylostoma braziliense and A caninum. Other animal hookworms, gnathostomiasis, and strongyloidiasis may also cause this syndrome. Infections are common in warm areas, including the southeastern United States. They are most common in children. The disease is caused by the migration of worms through skin; the nonhuman parasites cannot complete their life cycles, so only cause cutaneous disease.