Human itch mite (Scabies)

Human skin, specifically within the stratum corneum (the upper layer of the epidermis)

Human skin cells and extracellular fluid

The female mite burrows into the skin to deposit eggs, creating characteristic small, thread-like zig-zag lines. They are most active at night, which is when itching typically worsens. Transmission usually occurs through prolonged skin-to-skin contact.

Causes scabies, a highly contagious skin infestation characterized by intense itching and a pimple-like rash. If left untreated, scratching can lead to secondary bacterial infections like impetigo or cellulitis. There are no known benefits to humans or the ecosystem.