What is Scabies? Symptoms, Causes, Diagnosis, and Treatment

Key Takeaways

  • Sarcoptes scabiei mites burrow into skin within 30 seconds of contact, with female mites laying 2-3 eggs daily for up to 2 months in tunnels beneath the epidermis.
  • Itching intensifies at night because mite activity increases in response to the body's warmer temperature and higher cortisol levels during sleep cycles.
  • Transmission requires direct skin contact for 15-20 minutes—brief handshakes or hugs rarely spread the infection, but sexual contact and shared bedding are high-risk scenarios.
  • Permethrin 5% cream applied from neck down for 8-14 hours shows 95% cure rates, while oral ivermectin (200 mcg/kg) may require a second dose 1-2 weeks later.
  • Symptoms can persist for 2-4 weeks after successful treatment due to allergic reactions to dead mites and debris, even when all live parasites are eliminated.

Scabies is a contagious skin condition caused by tiny mites called Sarcoptes scabiei. These eight-legged critters burrow into the upper layer of your skin, where they lay eggs. The eggs then hatch, and the mites climb to the surface of your skin, spreading to other parts of your body and potentially to other people.

Symptoms of Scabies

The most common symptoms of scabies include:

  • Intense itching, especially at night

  • A pimple-like rash

  • Tiny, raised, grayish-white or flesh-colored lines on the skin (burrows)

These symptoms can appear all over the body or be limited to specific areas, such as the wrists, elbows, genitals, buttocks, or the webbing between fingers. In children, itching and rash may also occur on the head, face, neck, palms, and soles of the feet.

What is Scabies? Symptoms, Causes, Diagnosis, and Treatment

How Scabies Spreads

Scabies is highly contagious and spreads through direct, prolonged, close physical contact with an infected person. It can also spread by sharing bedding or clothing with someone who has scabies. Scabies mites can live on the human body for 1 to 2 months and can survive in bedding or furniture for 2-3 days.

Scabies outbreaks often occur in places where people have close physical contact, such as:

  • Nursing homes

  • Extended care facilities

  • Prisons

  • Childcare centers

In healthy adults, scabies is most often spread through sexual contact with an infected person. It's important to note that you cannot get scabies from pets.

Diagnosing Scabies

If you suspect you have scabies, consult a healthcare professional. They may be able to diagnose scabies by examining the rash or burrows on your skin. In some cases, they might try to remove a mite from its burrow by scraping your skin or using a thin needle to extract the parasite.

Treating Scabies

Scabies is treatable with prescription medications that kill the mites and their eggs. These medications, such as permethrin cream or ivermectin, are usually applied to the skin or taken orally. It's essential to follow your healthcare provider's instructions carefully and treat all household members and sexual partners simultaneously to prevent reinfestation.

In addition to medical treatment, it's crucial to wash all bedding, clothing, and towels used by the infected person in hot water and dry them on high heat to kill any remaining mites.

If you think you have scabies, don't hesitate to seek medical help. With proper diagnosis and treatment, you can eliminate the mites and find relief from the itching and discomfort. Remember, early intervention is key to preventing the spread of scabies to others.

For more information on scabies, visit the World Health Organization's fact sheet.

The Bottom Line

Early treatment with prescription medications like permethrin cream effectively eliminates mites within days, but treating all household contacts simultaneously is essential to prevent reinfestation cycles. The distinctive nighttime itching pattern and visible burrow tracks help distinguish this condition from other skin rashes. If you're experiencing intense nighttime itching or suspect exposure, Doctronic can help evaluate your symptoms and guide appropriate treatment.

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