Demodex

Tom's face was infested with Demodex mites, causing symptoms of itching, inflammation, and hair loss.

Source: tatoeba (6620786)

The growing interest in demodex over the past 20 years has expanded our understanding of this tick and its pathogenetic role. […] In addition, the number of demodexes in children is generally lower than in adult patients, presumably due to the relatively shorter period of infection.

Source: wiktionary