Itch mite (Sarcoptic mange mite)

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

Skin cells and extracellular fluid; they consume these as they burrow through the skin

The female mite burrows into the skin to lay eggs, creating tiny zigzag tunnels. This activity is what causes the symptoms of scabies.

Risks include scabies, a highly contagious skin infestation causing intense itching and a pimple-like rash. Benefits are negligible as they are parasitic.