Demodex mites Shape Something That You Never Wanted to Know about Demodex mites! 😨😮 They are invisible to the naked eyes unless aided by a microscope. The adult Demodex mite is around 0.3 mm in length. They have semi-transparent elongated bodies with eight short segmented legs. At night they can walk on the oily skin at a speed of 8 to 16 cm per hour. 😥