Scabies is an extremely infectious and itchy skin infestation caused by Sarcoptes scabiei, a parasitic mite that is able to survive and lay eggs under the skin for months. The mite may come into contact with human skin, forming long trails that look like tiny raised discolored lines, where it flies under the skin. It then traps into the skin more deeply and lays eggs that hatch and grow into adult mites. The mites multiply rapidly, causing extreme itching, especially when the mites are more active at night. Throughout the region of infestation, where the skin breaks down, tiny reddish bumps are formed, inviting still more bacterial infections.