Scabies: Symptoms, Transmission & Treatment

Medical review: Drª. Aleksana Viana
Dermatologist
July 2022
  1. Symptoms
  2. Transmission
  3. Treatment

Scabies is an infectious disease caused by the Sarcoptes Scabiei mite, which attacks the skin and causes symptoms like intense itching and redness.

This disease is easily transmitted between members of the same household by sharing clothes, bed linens or towels. Avoiding direct contact with infected skin is advised, at least until treatment is completed. Although it is more frequent in family, scabies mites do not attach to dogs, as dog mites are different species. 

Scabies is curable with the right treatment, prescribed by a dermatologist. Treatment usually involves the use of medications like permethrin and benzoyl, which help to eliminate the mite and relieve associated symptoms. 

Imagem ilustrativa número 1

Main symptoms

The most common symptom of scabies is intense skin itching that worsens at night. Other common symptoms include: 

  • Small blisters on the skin, particularly between skin folds
  • Red raised rashes 
  • Thin, irregular burrow tracks that become blisters 

During the initial infection, symptoms usually emerge within 2 months of exposure. In subsequent scabies infections, symptoms can appear more quickly, usually within 4 days. 

Although a patient may not have symptoms, they are able to transmit the disease to others if they have been exposed. Therefore, if you have had contact with someone who is infected, especially someone in your family or in the same household, the doctor may advise treatment regardless of symptom presentation. 

How it is transmitted

Scabies is a very contagious disease that can easily spread from person to person through direct contact of the skin. The female Sarcoptes Scabiei mite lives and deposits her eggs in the outermost layer of the skin, which facilitates transmission.

In addition, this disease can be transmitted even if the patient does not have any symptoms. Even if you do not think you have scabies, you should adopt certain habits to prevent the transmission of these types of illnesses. Some examples include: 

  • Avoid sharing towels
  • Avoid sharing unwashed clothes 
  • Wash your skin at least once per day
  • Avoid direct contact with people who live in unsanitary environments 

Clothing that are not washed frequently should be placed inside a closed plastic bag until they are used again, as this will prevent the deposit of mite eggs onto the clothes. 

Treatment options 

Treatment for scabies should be monitored by a dermatologist, and will vary with the severity of infestation and the patient’s skin type. Nonetheless, treatment is usually completed with medications such as: 

  • Permethrin: This cream should be applied to the skin to eliminate the mites and eggs. It can be used in adults, pregnant women and children over 2.
  • Crotamiton: This can be purchased as a cream or lotion and is applied on a daily basis. It is contraindicated for pregnant or breastfeeding women. 
  • Ivermectin: This pill strengthens the immune system and helps to eliminate the mites. It should not be used by pregnant or breastfeeding women, nor by children weighing less than 15 kg (about 33 lb).

Generally, these medications are applied to the entire body, from the neck down. They should stay on the skin for 8 hours, and therefore many patients are advised to apply them prior to bed. In addition, patients should maintain adequate hygiene and wash all clothing, bed linens or towels in hot water after use. 

Home remedies for scabies

A great natural remedy to relieve scabies symptoms and facilitate treatment is aloe vera gel. This gel contains properties that soothe the skin and reduce itching while also helping to eliminate the mites. To use natural aloe vera, you should remove the gel from the inside of an aloe vera plant and spread it over affected areas of the skin. Allow it to sit for at least 15 minutes, then remove with water and a mild, pH-neutral soap.

Was this information helpful?

Edited by Tua Saude editing team in July 2022. Medical review completed by Drª. Aleksana Viana - Dermatologist in June 2022.
Medical review:
Drª. Aleksana Viana
Dermatologist
Post graduate in Clinical Dermatology, Cosmiatric and Surgery by CMMG in 2012 and member no. 16907 of CRM-PE, Brazil.