Scabies is a mite that burrows in the layers of skin of a human, (or animal), and lays its eggs, causing rashes and/or itchy spots.
It is transmitted through close physical contact, whether having contact with the objects used, (ie, bedding, or clothing, etc) or sexual activity with the infected individual. Scabies is long term and infects the skin, (until treated), and can take 4-6 weeks from exposure, just for the skin irratation to appear. 300 million people get Scabies every year.