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Overview

What Is Scabies?

Scabies is a contagious skin infestation caused by microscopic Sarcoptes scabiei mites. The mites burrow into the outer layer of skin, where they trigger an itchy rash. Scabies spreads mainly through prolonged, close skin-to-skin contact, especially among household members and intimate contacts. It can affect people of any age and is not a sign of poor hygiene.

Symptoms

Scabies Symptoms

Scabies symptoms commonly begin several weeks after a person is exposed for the first time. Someone who has had scabies before may develop symptoms sooner after a new exposure. Common scabies symptoms include severe itching, particularly at night, and a rash in areas where mites burrow. Because other skin conditions can look similar, a clinician can help determine what the rash is.

  • Intense itching that is often worse at night.
  • Small itchy bumps that form a scabies rash.
  • Thin, raised burrow lines caused by mites under the skin.
  • Sores caused by scratching.
  • A rash between the fingers.
  • A rash on the wrists, elbows, waist, buttocks, nipples, or genitals.

Severe form

Crusted scabies needs prompt care

Crusted scabies, also called Norwegian scabies, can cause thick crusts, extensive scaling, and a very large number of mites. It may cause less itching than expected, particularly in older adults or people with weakened immune systems. Seek prompt medical evaluation because this form can spread easily and usually needs more intensive treatment.

How It Spreads

How Scabies Spreads

Scabies usually spreads through prolonged, close skin-to-skin contact. It is more likely to pass between household members, sexual partners, caregivers, and people living in crowded settings. A person may spread scabies before noticing symptoms, so close contacts may need evaluation and treatment at the same time.

  • Scabies most often spreads through prolonged skin-to-skin contact.
  • A person can spread scabies before noticing symptoms.
  • Brief contact such as a handshake is less likely to spread ordinary scabies.
  • Shared clothing, towels, or bedding can occasionally spread mites.
  • Crusted scabies can spread more easily because it contains many mites.

Risk Factors

Scabies Risk Factors

  • Living in a crowded household or shared living facility increases exposure risk.
  • Having close contact with someone who has scabies increases risk.
  • Providing hands-on care for an affected person increases risk.
  • Being an older adult can increase the risk of crusted scabies.
  • Having a weakened immune system can increase the risk of crusted scabies.
  • Having limited ability to scratch or report itching can delay recognition.

Complications

Scabies Complications

Scratching a scabies rash can break the skin and allow bacteria to cause an infection. Crusted scabies can lead to extensive scaling and may spread rapidly to other people. Severe itching can also disrupt sleep and daily activities.

  • Scratching can cause open sores and bacterial skin infection.
  • Crusted scabies can cause thick scales and extensive skin involvement.
  • Severe itching can interfere with sleep and daily activities.
  • Itching can continue for several weeks after successful treatment.

Possible infection

Know the signs of a skin infection

Seek medical care for spreading redness, warmth, swelling, pus, fever, or rapidly worsening crusted areas. These signs may indicate a bacterial infection or severe scabies that needs prompt treatment.

Diagnosis

How Scabies Is Diagnosed

Scabies is usually diagnosed through a clinical examination. A clinician considers the pattern of itching, the rash, visible burrows, affected body sites, and whether you have had close contact with someone who has scabies.

When testing may help

A skin scraping, dermoscopy, or another examination may be used to look for mites, eggs, or mite waste. A negative scraping does not always rule out scabies because a sample may miss the affected area. Clinicians may also consider eczema, allergic rashes, bedbugs, or other causes of itching.

Treatment & Management

Scabies Treatment and Management

Scabies treatment requires a clinician-recommended scabicide, commonly permethrin cream, applied exactly as directed. Oral ivermectin may be used in selected cases, while crusted scabies often requires more intensive combination treatment. Following the full treatment plan and coordinating care for close contacts helps prevent reinfestation.

  • Apply permethrin cream for scabies exactly as prescribed and repeat it if instructed.
  • Close household and sexual contacts may need treatment even if they have no symptoms.
  • Wash and dry recently used clothing, towels, and bedding using hot settings when possible.
  • Seal items that cannot be washed in a closed bag for the period recommended by a clinician.
  • Do not share clothing, towels, or bedding until treatment is complete.

Treatment expectations

Itching may not stop immediately

Scabies cannot always be reliably eliminated in 24 hours from a symptom perspective. Medication may kill the mites promptly, but itching and skin irritation can continue afterward. New burrows or a worsening rash should be reassessed by a clinician.

Prevention

Scabies Prevention

  • Seek medical advice promptly when scabies is suspected.
  • Tell household members and close contacts so they can receive appropriate guidance.
  • Follow the treatment schedule for everyone who is advised to be treated.
  • Wash or heat-dry recently used clothing, towels, and bedding.
  • Avoid prolonged skin-to-skin contact until treatment instructions say it is safe.

Outlook and Prognosis

Scabies Outlook and Prognosis

Scabies is generally curable when the recommended treatment is used correctly. The rash and itching may take several weeks to settle, even after the mites have been eliminated. Close contacts may need coordinated treatment to prevent reinfestation and make it easier to get rid of scabies completely.

  • New burrows after treatment may suggest reinfestation or incomplete treatment.
  • Persistent itching alone does not always mean live mites remain.
  • Worsening redness, pain, crusting, or drainage may indicate a complication.
  • Symptoms in close contacts may lead to repeated household spread.

When Should You See a Doctor

When Should You See a Doctor for Scabies?

  • See a healthcare professional for a new unexplained itchy rash that is worse at night.
  • Seek advice after close contact with someone diagnosed with scabies.
  • Arrange prompt evaluation for an infant, older adult, or person with a weakened immune system.
  • Get medical care for thick crusts, extensive scaling, or rapidly spreading skin changes.
  • Seek care for fever, increasing redness, warmth, swelling, pus, or worsening pain.
  • Contact a clinician if new burrows appear or symptoms do not improve as expected after treatment.

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