Sarcoptes scabiei is a microscopic mite that causes scabies, a contagious skin condition. These tiny parasites burrow into the outer layer of the skin, leading to intense itching and irritation. Scabies is spread through close physical contact, making it common in crowded living conditions. The life cycle of Sarcoptes scabiei involves several stages, including eggs, larvae, and adult mites. The female mite lays eggs in the burrows she creates, and the entire life cycle can be completed in about two to three weeks. Treatment typically involves topical medications to eliminate the mites and relieve symptoms.