Scabies is an infestation of the skin with the microscopic mite Sarcoptes scabei. Infestation is common, found worldwide, and affects people of all races and social classes. Scabies spreads rapidly under crowded conditions where there is frequent skin-to-skin contact between people, such as in hospitals, childcare facilities, nursing homes and detention facilities such as jails and prisons.
What are the signs and symptoms of scabies infestation?
Signs of scabies include the following:
- Intense itching, especially at night and over most of the body.
- Pimple-like irritations, burrows or a rash of the skin that appears in the webbing between the fingers, the skin folds on the wrist, elbow, or knee, the penis, the breast, or shoulder blades.
- Sores on the body caused by scratching. These sores can sometimes become infected with bacteria.
How did I get scabies?
- By direct, prolonged, skin-to-skin contact with a person already infested with scabies.
- Contact must be prolonged (a quick handshake or hug will usually not spread infestation).
- Infestation is easily spread to sexual partners and household members.
- Infestation may also occur by sharing clothing, towels, and bedding.
Who is at risk for severe infestation?
People with weakened immune systems and the elderly are at risk for a more severe form of scabies, called Norwegian or crusted scabies.
How long will mites live?
- Once away from the human body, mites do not survive more than 48-72 hours.
- When living on a person, an adult female mite can live up to a month.
Did my pet spread scabies to me?
No. Pets become infested with a different kind of mite. If your pet is infested with mite (also called mange), and they have close contact with you, the mite cause itching and skin irritation. However, the mite dies in a couple of days and does not reproduce. The mites may cause you to itch for several days, but you do not need to be treated with special medication to kill the mites. Until your pet is successfully treated, mites can continue to cause you to have symptoms.
How soon after infestation will symptoms begin?
- For a person who has never had itching from scabies, symptoms may take 4-6 weeks to begin.
- For a person who has had scabies, symptoms appear within several days.
- You do not become immune to an infestation.
How is scabies infestation diagnosed?
Diagnosis is most commonly made by looking at the burrows or rash. A skin scraping may be taken to look for mites, eggs, or mite fecal matter to confirm the diagnosis. If a skin scraping or biopsy is taken and returns negative, it is possible that you may still be infested. Typically, there are fewer than 12 mites on the entire body of an infested person; this makes it easy for an infestation to be missed.
Can scabies be treated?
- Yes. Several medications are available to treat scabies. Always follow the directions provided by your physician or the directions on the package insert. A second treatment may be necessary a week later.
- Pregnant women and children are often treated with milder scabies medications.
Who should be treated for scabies?
Anyone who is diagnosed with scabies, as well as his or her sexual partners and people who have close, prolonged contact to the infested person, should also be treated. If your health care provider has instructed family members to be treated, everyone should receive treatment at the same time to prevent re-infestation.
How soon after treatment will I feel better?
- Itching may continue for up to 6 weeks, and does not mean that you are still infested. Your health care provider may prescribe additional medication to relieve itching if it is severe.
- You will know that the medication has been effective if no new burrows or rashes should appear 24-48 hours after effective treatment.
- A rash may persist even if all the mites are effectively killed. This may be due to an allergic dermatitis, or inflammation of the layers of the skin. In these cases, topical or systemic steroid treatment may be recommended.