noun
itch mite; Sarcoptes scabiei
A parasitic mite that causes scabies in humans and animals. The term is used in medical and biological contexts.
ヒゼンダニは疥癬の原因となる寄生虫です。
The itch mite is a parasite that causes scabies.
皮膚科でヒゼンダニの検査を受けた。
I was tested for itch mites at the dermatologist.
疥癬 is the disease scabies itself, while ヒゼンダニ is the mite that causes it.
The term is a compound of 皮癬 (hizen, an old term for scabies) and ダニ (dani, mite). The kanji 皮癬 is rare and the word is now predominantly written in katakana.