A scabies rash occurs when the microscopic Sarcoptes scabiei mite burrows into human skin and lays eggs. The itchy rash spreads as mites continue to burrow and reproduce.
It may take up to two months for a scabies rash to appear after a person is infested for the first time. Subsequent infestations usually cause symptoms in a few days, according to the Centers for Disease Control.
A scabies rash may appear as tiny bumps and blisters, particularly in the folds of the skin, and be intensely itchy. Itching may be worse at night.
Anyone can get scabies, and it spreads easily in crowded conditions. Scabies often spreads in nursing homes, prisons and child care facilities, according to the CDC.
Scabies is primarily spread through close physical contact, according to Mayo Clinic. Sometimes it is transmitted by sharing clothing or bedding. When a person has been infested, he can spread scabies to others even before the rash develops.
Scabies is usually treated with scabicides, which are special lotions that kill the mite.
Avoid close contact with anyone who has scabies. Prevent re-infestation by washing all clothes and bedding in hot water and sealing items that cannot be washed in a plastic bag placed away from living areas for a couple of weeks.