About Scabies

Overview

Scabies is a highly contagious skin condition caused by tiny mites called Sarcoptes scabiei. These mites burrow into the skin and lay eggs, leading to intense itching, especially at night. The eggs hatch and new mites create new burrows, causing a rash with small, red or discolored blisters or bumps. Scabies can also manifest as thin tracks on the skin. It is commonly found in close quarters and living facilities, and it can affect individuals of all ages. In severe cases, a rare form known as Norwegian or Crusted Scabies may occur. Treatment options include medications, topical creams, and phototherapy, but it is important to consult with a healthcare professional for appropriate guidance. Scabies can spread quickly in areas with close physical contact, so it is important to take precautions to prevent its transmission.

Causes and Risk Factors

The cause of scabies is infection of the skin by the mite Sarcoptes scabiei. This highly contagious ectoparasitic skin disease leads to severe itchiness and pruritic skin lesions. Scratching the affected areas can cause secondary bacterial infections. Immune responses and inflammatory reactions play a role in the underlying mechanisms of scabies infection.

Non-modifiable risk factors for scabies include:

Age: The risk of scabies is higher in infants and children; and the elderly (especially people who live in nursing homes).
Immunocompromised conditions: The risk is higher in people with conditions such as HIV infection, acute myeloid leukemia, kidney transplantation, or people taking immunosuppressants.
Diabetes.

Modifiable risk factors for scabies include:

Presence of many children in the household.
Living in close, crowded conditions.
Sharing clothes and towels.
Irregular showering.
Caregivers of people with scabies, including healthcare workers.
People who are sexually active.

It's important to note that these risk factors can vary among different individuals, and not everyone with these risk factors will develop scabies. Additionally, it's essential to practice good hygiene and avoid close contact with infected individuals to reduce the risk of scabies transmission.

Symptoms

Common symptoms of scabies include:

Dry, scaly skin.
White-colored lines in the skin where mites have burrowed.
Severe itching, especially at night.
Pimple-like skin rash.

As scabies progresses or becomes more severe, additional symptoms may include:

Rashes that may affect much of the body or be limited to common sites such as between the fingers, wrists, elbows, armpits, genitals, nipples, waist, buttocks, and shoulder blades.
Multiple papules and vesicles (small fluid-filled bumps) or even urticaria (hives) on specific sites.
Blisters.

In some cases, scabies can also lead to complications such as secondary bacterial infections. These infections may cause conditions like impetigo, ecthyma, paronychia (infection around the nails), furunculosis (boils), or poststreptococcal glomerulonephritis (kidney inflammation). However, it's important to note that these complications are rare.

Remember to consult with a healthcare professional for an accurate diagnosis and appropriate treatment.

Diagnosis

To diagnose scabies, healthcare providers may perform the following examinations, tests, and procedures:

History and Physical exam: A healthcare provider will take a detailed history about any symptoms or factors that may be contributing to your condition. They will conduct a physical exam to look for signs of scabies, such as rashes, burrows, or red bumps on the skin.
Skin scraping: This is the most commonly used diagnostic test for scabies. A small area of the skin is scraped to collect a sample of skin cells and mites for examination under a microscope.
Adhesive tape test: In this test, transparent adhesive tape is applied to the affected area and then removed to collect mites or eggs for examination under a microscope.
Dermoscopy: This technique uses a handheld device called a dermatoscope to examine the skin closely and identify characteristic signs of scabies.
PCR antigen detection: Polymerase chain reaction (PCR) tests can detect the DNA of scabies mites in skin samples.

Additional examinations, test or procedures may be performed based on initial findings or individual factors.

Treatment Options

The goals of treatment for scabies are to eliminate the mites, relieve symptoms, prevent transmission, and treat complications. Treatment options include:

Topical scabicides: These are creams or lotions that are applied to the skin to kill the mites. Permethrin is a commonly used scabicide. It works by paralyzing and killing the mites.
Oral ivermectin: Oral ivermectin may be used as an alternative treatment. It works by interfering with the nervous system of the mites, leading to their death.
Environmental measures: Along with medical treatment, it is important to take steps for environmental disinfection. This includes washing clothes and bed sheets at high temperatures and thoroughly drying them. It helps to remove any mites or eggs that may be present in the environment.
Identifying and treating close contacts: It is crucial to treat all close contacts simultaneously because they may have been infected without showing symptoms yet. Treating them helps prevent further transmission of scabies.
Treating complications: Complications such as itch or dermatitis may occur as a result of scabies. Treating these symptoms can provide relief and improve overall comfort.

It is important to note that treatment recommendations may vary, so it's best to consult with a healthcare professional for personalized advice. Medication dosing may be affected by various factors, so always check with your healthcare professional for appropriate dosing instructions. Side effects can occur, so it's important to consult with your healthcare professional or refer to the medication information for side effect information.