Ask the Pediatrician: What is scabies?

By Dr. Sarah Asch, American Academy of Pediatrics

Scabies is an itchy rash caused by the human itch mite. Adults, children and babies can all get scabies. Many people believe scabies is about cleanliness, but that is not true. It is easily passed between people living closely with other people. Let’s discuss how scabies makes you itchy and how to get rid of scabies safely.

The human itch mite is microscopic in size. It can burrow into the very top layer of the skin (not any deeper), where it can lay eggs and eat. The mites are so tiny, there is no way to see them by looking with your eyes before the scabies rash starts. After a few days or weeks, an itchy rash develops in reaction to the mites.

Scabies rash looks different at different ages. Babies and toddlers, very elderly people or people with weakened immune systems can have a rash all over the body. In older children and adults, the rash is mostly on the hands, feet, armpits, belly button and genitals. It can look like hives (welts), pimples (pus bumps), blisters (tiny areas of fluid filled skin) or crusty bumps. But some people do not react with rash at all. It is very common to have one or two people with a rash in the house, but everyone at home is exposed and needs to be treated.

Scabies is diagnosed by looking carefully at the skin. The pattern of the rash, along with the story of when it started and who else is itchy, is usually enough for diagnosis. Sometimes your doctor may perform a skin scraping to look for the mite or other clues under the microscope.

To get rid of scabies, you have to treat the people and the environment you live in all at the same time. All the people who come into regular contact need to be treated. This means everyone who lives with you, and regular visitors such as babysitters and grandparents.

How you apply the treatment cream for scabies makes a big difference.

Permethrin 5% cream is the most commonly used medicine to treat scabies in adults, children and infants. In babies and toddlers under age 2, the cream is applied to the scalp, neck and over the whole body to the toes. In older children and adults, the cream is applied from the neck down to the toes. The cream needs to get into all the body folds, including armpits, belly button, crack of the buttocks, around the scrotum and penis, and spaces between the fingers and toes. It does not need to be used on the face.

Permethrin cream is left on the skin overnight for eight to 14 hours before it is rinsed off the next day. The treatment needs to be repeated in one week to take care of any eggs that hatched after the first treatment.

Other creams and oral medicines are sometimes needed in specific situations. Not all medications can be used in very young infants and pregnant women. Your doctor will help prescribe the right scabies treatment for your family.

The mite can live for short periods of time outside of the skin on cloth items. This can be clothes, stuffed animals, bed linens, towels, soft parts of strollers, car seats, furniture and highchairs, to name a few places.

To get rid of scabies from the home, wash clothing, bed linens and towels using hot water and dry using the hot cycle. Vacuum furniture, carpets, car seats and strollers. If you can’t wash or vacuum an item due to size or because it will damage it, you can place it in a sealed bag for at least 72 hours. Where needed, items can be dry-cleaned.

Your pets do not get human scabies. You do not need a special exterminator, just careful cleaning of the bed linens, furniture and other items as listed above.

You can all return to normal activities the day after all family members have started treatment, which means the day after the first overnight application of the permethrin cream.

Sometimes after the scabies are gone, children and adults can be itchy for several weeks. Other topical medications can be helpful with this problem. It is called “post-scabetic pruritus,” which means “after-scabies itch.” It can make parents nervous, but it’s very common, especially if your child had a big rash due to scabies.

Scabies goes away very well when the treatments and cleaning steps are followed carefully. But, if you, your child or anyone in the house is still getting new bumps two weeks after the last treatment, that person needs to be checked again.

Crusted scabies is when a person has a large amount of scabies mites on their skin and they are present in large crusts. It is a very contagious version, because it has a lot of scabies mites to pass around. It can occur in people with weakened immune systems. It has a distinctive appearance and is quite rare in children.

Be sure to ask your doctor if you have any questions or concerns along the way.

ABOUT THE WRITER

Sarah Asch, MS, MD, FAAP, FAAD is a pediatric dermatologist. She runs a solo pediatric teledermatology practice, Hometown Pediatric Dermatology, which is on a mission to improve care for children’s skin problems in rural populations in the Upper Midwest. She currently serves as an adjunct faculty at the University of Minnesota.

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Source: Orange County Register