Eczéma herpétique

What is eczema herpeticum?

Eczema herpeticum is a bad skin infection that occurs in people who already have eczema. The herpes virus (the same one that causes cold sores) invades the skin and causes painful red spots. The rash can spread very quickly over the body and needs to be treated quickly.

Is eczema herpeticum contagious?

Usually the virus is caught from somebody who has an infection such as a cold sore. It takes 5-12 days after contact with the infected person for the rash to develop.

Eczema herpeticum can happen at any age. However, it is most common in young children who already have eczema. See the separate leaflet called Atopic Eczema. The eczema causes breaks in the skin which allows the virus in. So it can also happen to people who have other causes of skin breaks - for example, brûlures or other types of skin conditions.

A child or person with eczema herpeticum develops a skin rash which looks like lots of little blisters. These are usually in areas where there has been a skin condition (usually atopic eczema). The spots are usually quite painful. The spots then spread to other areas of skin. Eczema herpeticum can develop on any part of the body but is most common on the face or neck.

The blisters are all around the same size. They are filled with fluid which may be a clear fluid or a yellowish fluid called pus. They may bleed or ooze or weep. They then become crusted over.

People with eczema herpeticum feel unwell. They may have a fièvre élevée and may be able to feel lumps called lymph nodes in your neck, armpits or groin. These come up in response to the infection, to help fight it.

Eczema herpeticum is often confused with other skin infections. As it starts with just a few small red spots, it is often confused with varicelle. The key difference to chickenpox here is that eczema herpeticum has lots of tiny red spots very close together whereas chickenpox often has slightly larger red spots that are a bit further apart.

As eczema herpeticum is often on the face or around the mouth, it is often confused with impétigo (a common skin infection caused by bacteria). The difference is that a child with eczema herpeticum will often be generally unwell, with a fever, whereas with impetigo they don't usually feel ill.

Sometimes the rapid appearance of the red spots of eczema herpeticum is confused with a simple flare-up of eczema. The main difference is that normal eczema is itchy whereas eczema herpeticum is painful.

If you think you or (more likely) your child have eczema herpeticum it is vital that you see a doctor to check the diagnosis: eczema herpeticum needs to be treated correctly and promptly, otherwise it can become very serious.

Hospital specialists may take a small sample (a swab) of the fluid in one of the spots and send it to the laboratory for testing. Specialist tests can show the herpes virus, which confirms the diagnosis. Most GPs do not have access to these tests which are usually only available in hospital.

This photo shows the typical appearance of eczema herpeticum in a young child:

Eczema herpeticum in a young child

© Mohammad2018 (Own work) via Wikimedia Commons

Traitement hospitalier

Eczema herpeticum is considered an emergency. This is because it can spread quickly. So it must be treated correctly and quickly. Someone with eczema herpeticum will normally be sent to hospital that day for advice from a specialist. In children it is quite common to be admitted to hospital while having the first few days of treatment. In adults, particularly if the infection is mild, it may be sufficient to take tablets at home.

It is important not to be tempted to put a steroid cream on the eczema herpeticum as this will usually make it a lot worse.

Antiviral medicine

Antiviral medicine such as aciclovir is usually very successful for treating eczema herpeticum. It may be given as a liquid or a tablet. For people who are too unwell to take it as a liquid or a tablet, it can be given by a drip (intravenously).

Antibiotiques

Parfois, un antibiotique may be needed as well. This is because the damage to the skin makes it more likely to become infected by the bacteria which is normally harmlessly present on the skin. This is called a secondary bacterial infection.

Herpes is a very infectious (contagious) virus; it can be caught easily by touching the skin of someone with herpes. For example,, there is a high chance of developing a cold sore after kissing someone who has a cold sore.

With eczema herpeticum, someone with damaged skin from eczema who touches eczema herpeticum will have a reasonable chance of developing the infection too. This is particularly so if the eczema is inflamed or the skin is very broken.

If a child is hospitalised with eczema herpeticum, visitors will probably have to wear gloves and an apron. Elderly people or anyone who is unwell or frail will be advised not to visit them in hospital.

So someone with eczema herpeticum should avoid contact with:

• Children with atopic eczema.

• People who have problems with their immune systems (immunosuppression). This would include people with SIDA, people who have recently had chemotherapyor people who are on steroid medication.

• Newborn babies.

As long as eczema herpeticum is treated quickly with the correct antiviral medicine, the outlook (prognosis) is very good. The spots usually heal up and go away in 2-6 weeks. If it is not treated quickly, however, it can spread rapidly and may have complications. Information on complications can be found in the Further Reading NICE Clinical Knowledge Summary reference below.

It can cause damage to eyesight, there may be secondary infections with other germs such as bacteria and, in people whose immune systems are not working well, it may occasionally cause death. This is because it may cause damage to other organs such as the brain, liver or lungs if it spreads.

Usually eczema herpeticum is cured by the antiviral medication. Sometimes eczema herpeticum can come back and need to be treated again.