An extremely itchy condition caused by an infestation of itch mites is known as?

The condition described as "an extremely itchy condition caused by an infestation of itch mites" is accurately identified as scabies. Scabies is specifically caused by the Sarcoptes scabiei mite, which burrows into the skin, leading to intense itching and an inflammatory response. The itchiness is primarily due to the body's allergic reaction to the presence of the mites and their waste products.

In the context of other skin conditions, dermatitis is a broad term that refers to inflammation of the skin but is not directly linked to an infestation. Psoriasis is a chronic autoimmune condition characterized by red, scaly patches on the skin, which is not caused by mites. Eczema (atopic dermatitis) is a condition associated with itchy, inflamed skin, but it has different underlying causes related to allergies and immune dysfunction rather than mite infestation. Thus, scabies stands out as the specific condition related to the described symptoms.