Miticide. I’ve been treating for them with this stuff with good results https://www.amazon.com/Amazing-Doctor-Zymes-DZE1QT-Concentrate/dp/B07C8C2GLY/ref=mp_s_a_1_3?crid=DOAMJF5BJXXX&keywords=dr+zymes&qid=1662321217&sprefix=dr+z%2Caps%2C112&sr=8-3