WebMD offers a set of human skin parasites that include bedbugs, lice and scabies. The Bohart Museum of Entomology features photos of mites that bite humans, causing itchy red papules. Most mites actually live permanently on other animals, to whom they return after biting humans, according to the museum.
Bedbugs typically live in bedding and feast on the blood of those sleeping there. Scratching the bites can cause infection. Lice live in body hair and also eat human blood. Lice are easily transmitted from one person to another through physical contact. Scabies is an itchy, scaly condition caused by parasites that burrow into the skin to lay eggs, WebMD explains.