Roseola: the fever-then-rash illness in babies and toddlers
Your baby has had a high fever for several days, and then, just as you start to relax because their temperature has finally come down, a pink rash appears all over their chest and back. This can feel alarming, but it is actually a reassuring sign. What you are most likely looking at is roseola, one of the most common viral illnesses of early childhood, and the appearance of the rash usually means the hard part is already behind you.
What roseola is
Roseola is a common viral illness caused by human herpesvirus 6, known as HHV-6. It is sometimes called sixth disease or three-day fever, though the fever can last anywhere from three to five days. It is one of the most common causes of fever in babies and toddlers in the first two years of life, and most children will have had it by their second birthday.
The illness is generally mild, and the vast majority of children recover completely at home without any medical treatment. The fever, however, can be alarming because it is often very high, sometimes reaching 39 to 40 degrees Celsius, and it may appear with no other obvious explanation in the early days. Once a baby has had roseola, they have lifelong immunity and will not get it again.
Who gets roseola
Most cases of roseola occur between six months and two years of age, with the peak being between six and 15 months. It is unusual in babies under three months because they are still protected by maternal antibodies passed on during pregnancy. After the age of two, most children have already been infected and are immune.
Roseola spreads through saliva and respiratory droplets. Many adults carry HHV-6 without any symptoms and can unknowingly pass it on to babies and toddlers in their care. There is no vaccine against roseola, and because the illness is contagious during the fever phase before any rash appears, it is very difficult to prevent it spreading in nurseries and childcare settings.
The fever phase
The illness almost always begins with a sudden, high fever, often rising to 39 to 40 degrees Celsius, sometimes with very little warning. During the fever phase, which typically lasts three to five days, your baby may be irritable, less interested in food and more unsettled than usual. Some babies also develop mild cold-like symptoms or slightly swollen lymph nodes in the neck.
What is often striking about roseola is how little else is going on. There may be no obvious source of infection, which can make those first few days particularly worrying. Then the fever breaks, often quite suddenly. This can feel dramatic after days of a high temperature, but the sudden drop is actually a very good sign that the illness is resolving.
The rash
One to two days after the fever breaks, a pink or rose-coloured rash appears. It usually starts on the trunk, meaning the chest and back, and then spreads outward to the neck, arms and sometimes the face and legs. The rash consists of small, flat or slightly raised spots. By the time the rash appears, your baby is no longer contagious and is usually feeling much better.
The most important thing to know about the roseola rash is that it blanches, meaning it fades to white when you press it firmly with a finger or a clear glass. This is a reassuring sign. The rash is not itchy and does not cause discomfort, so it does not need any treatment. It fades and disappears on its own within one to three days.
Caring for your baby at home
Most babies with roseola can be cared for safely and comfortably at home. The goal is to keep them comfortable and well hydrated through the fever phase.
- Offer paracetamol (such as Calpol) or ibuprofen at the correct dose for your baby's age and weight to bring down the fever and ease discomfort. Follow the instructions on the packaging carefully and do not give more than the recommended dose. Do not give aspirin to babies or children under 16.
- Offer plenty of fluids. Breastfeeds, formula or water for babies over six months help prevent dehydration, which can make a baby feel worse. Signs of dehydration include fewer wet nappies than usual, a dry mouth and sunken eyes.
- Keep clothing light and the room at a comfortable temperature. Do not over-wrap your baby, as this can make a fever worse.
- A lukewarm bath can help your baby feel more comfortable, but do not use cold water to try to bring a fever down quickly.
- Extra cuddles and calm company will help your baby feel secure when they are unwell.
You do not usually need to take your baby to a doctor for uncomplicated roseola, but do call if you are worried or if anything does not feel right.
Febrile seizures and roseola
Because the fever in roseola rises quickly and can be very high, roseola is one of the more common triggers of febrile seizures, sometimes called febrile convulsions. A febrile seizure happens when a high temperature causes a brief disruption in the brain's electrical activity. It can look alarming, but in most cases it lasts under three minutes and does not cause any lasting harm.
If your baby has a febrile seizure, try to stay as calm as you can. Lay them gently on their side on a soft, flat surface so that any saliva can drain away safely. Do not put anything in their mouth. Note what time the seizure started and how long it lasts. Stay with them and speak to them calmly throughout.
Call 999 if the seizure lasts more than five minutes, if your baby does not recover and return to normal awareness within 30 minutes, or if you are worried. A baby who has their first febrile seizure should be seen by a doctor afterwards, even if they recover quickly. Having one febrile seizure does not mean your baby has epilepsy.
When to call a doctor
Most babies with roseola do not need to see a doctor. However, there are times when you should seek medical advice:
- Your baby is under six months old and has a high fever. Roseola is unusual at this age, but any high fever in a very young baby warrants prompt attention.
- The fever lasts more than seven days or your baby seems very unwell, unusually drowsy or is not responding to you normally.
- The rash does not blanch when you press it. A rash that stays red or purple when pressed can be a sign of something more serious, including meningitis, and needs urgent medical attention.
- Your baby has a febrile seizure for the first time. They should be seen by a doctor even if they recover quickly and seem fine afterwards.
- You are worried for any reason. You know your baby best, and trusting your instincts is always the right call.
Call 999 for any seizure that lasts more than five minutes, or if your baby loses consciousness, is struggling to breathe, or has a non-blanching rash.
Returning to nursery or childcare
A baby with roseola is contagious during the fever phase, before the rash appears. This means that by the time anyone knows your baby has roseola, they may already have exposed their nursery friends. Once the fever has gone and the rash has appeared, your baby is no longer contagious and can return to nursery or childcare. You do not need to wait for the rash to fully fade before they go back.
Frequently asked questions
How do I know if the rash is roseola?
The pattern is the main clue. Roseola almost always follows a high fever that lasts three to five days and then breaks suddenly. Shortly after the fever goes, a pink or rose-coloured rash of small flat or slightly raised spots appears on the chest and back, spreading outward to the neck and arms. The rash blanches when you press it. If your baby has had a high unexplained fever for several days and then develops a rash as the fever lifts, roseola is the most likely explanation.
Does the roseola rash need treatment?
No. The roseola rash is not itchy and does not cause discomfort. It fades and disappears on its own within one to three days and does not need any cream, antihistamine, or other treatment. By the time the rash appears, the illness is essentially over and your baby is likely to be feeling much better.
Can roseola cause febrile seizures?
Yes. Because the fever in roseola rises quickly and can be very high, roseola is one of the more common triggers of febrile seizures. A febrile seizure can be frightening to witness, but in most cases it lasts under three minutes and does not cause lasting harm. If your baby has a seizure, lay them on their side, do not put anything in their mouth, and note how long it lasts. Call 999 if the seizure lasts more than five minutes or if you are worried. A baby who has their first febrile seizure should be seen by a doctor even if they recover quickly.
Is roseola dangerous?
For most healthy babies and toddlers, roseola is a mild illness that resolves on its own within a week. The high fever can be alarming, and the risk of a febrile seizure is real, but serious complications are uncommon. Once your child has had roseola, they have lifelong immunity and will not get it again. Always seek advice if you are worried, if the fever lasts more than seven days, or if the rash does not blanch when pressed.
Is roseola contagious before the rash appears?
Yes. A baby with roseola is contagious during the fever phase, before any rash is visible. This means many babies will already have exposed their nursery peers before anyone knew they were unwell. Once the fever has gone and the rash has appeared, your baby is no longer contagious and can return to nursery or childcare.
Can adults catch roseola from their baby?
Most adults already carry HHV-6 from a childhood infection and are immune. In rare cases, an adult who has not previously been exposed could pick up the virus, but they are unlikely to develop the same fever-and-rash illness that babies do. The greater concern in most families is spread between young children who have not yet had roseola.
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