Mites are so small that they're almost impossible to see without a magnifying glass.
The first symptom of an infection is usually an annoying itch that's often most intense at night. Infestations are common between the fingers or toes, on the wrists, in the armpits, and on the genitals where the mites burrow into the skin and feed on blood. The openings of the burrows may swell and resemble pencil marks and later leave red bumps. Mites easily pass from one person to another with close contact such as sexual intercourse or by sharing towels or clothing. Sometimes an entire family can become infected.