Roseola in Babies: High Fever, Then a Rash
Roseola is a common viral illness in babies and toddlers. It starts with a sudden high fever that lasts around 3 days, often with no other symptoms, and ends with a pink rash that appears as the fever settles. The rash arriving is usually the sign the illness is ending. Here is how to recognise the pattern, how to keep your baby comfortable, and when to get them checked.
The pattern to recognise
Roseola is a common viral illness that most children meet before the age of 2, usually between 6 months and 2 years. What makes it confusing is the order things happen in: first comes a sudden high fever with little or nothing else to explain it, and only when the fever settles, usually after around 3 days, does the rash appear and give you the answer.
That reversal is the signature. With most childhood illnesses, a rash arriving is a reason to pay closer attention. With roseola, the rash arriving while your child perks up is usually the sign the illness is ending.
→ Fever with no other symptoms: what else it can mean
The fever phase
The roseola fever can be high and tends to come on quickly. Despite that, many babies remain more alert and interested than the thermometer suggests, especially between spikes. Some are irritable, feed less, or have mild loose stools or a slightly runny nose, but there is often no clear focus of illness during these first days.
Care during this phase is the same as for any fever. Offer milk or fluids often, dress your baby lightly, and give paracetamol by weight for comfort once they are uncomfortable or the fever is 38.5°C or above. How your baby behaves between spikes tells you more than the number itself.
→ Check the correct paracetamol dose by weight
The rash phase
As the fever settles, small pink or red spots appear, usually starting on the chest, tummy, and back, sometimes spreading to the neck, face, arms, and legs. The spots fade when you press on them, are not usually itchy, and do not bother the child. The rash needs no treatment and fades on its own within a day or two.
Always check that a rash fades when pressed. A rash of small red or purple spots that stays visible under pressure is not roseola and needs emergency care, whatever else is going on.
→ How to do the blanch test on any rash
Roseola and febrile seizures
Roseola fevers tend to rise fast, and a fast-rising fever is the usual trigger for febrile seizures in young children. Most children with roseola will not have one, and a febrile seizure, frightening as it is to watch, does not usually cause lasting harm. It is worth knowing what to do before you ever need to, rather than looking it up mid-seizure.
→ What to do during a febrile seizure, step by step
When to see a doctor
Roseola can only be recognised with confidence once the rash appears, so during the fever days treat it like any unexplained fever. See your GP or polyclinic if the fever lasts more than 3 days, if your baby is drinking much less than usual, or if you are unsure and want them checked. A baby under 3 months with a temperature of 38.0°C or above needs urgent assessment, and that is never assumed to be roseola.
Go to the nearest 24-hour A&E, or call 995, if your baby:
- !Has a rash that does not fade when you press on it
- !Is unusually drowsy, floppy, or very hard to wake
- !Is breathing fast or struggling to breathe
- !Is drinking very little, with far fewer wet nappies than usual
- !Has a seizure, or jerking movements that do not stop within a few minutes
→ Fever in a baby under 3 months: what to do
→ How long does a fever usually last in a child?
Frequently asked questions
How do I know if my baby's rash is roseola?+
The timing is the clue. With roseola, the rash appears as the fever settles, usually after around 3 days of high fever, and the child starts looking better as it comes out. The rash is small pink or red spots, mostly on the chest, tummy, and back, and it fades when pressed. A rash that arrives while your child is getting sicker, or that does not fade when pressed, is a different situation and needs urgent attention.
How long does the roseola fever last?+
Usually 3 to 4 days. The fever is often high and can come on suddenly, but many babies stay surprisingly alert between spikes. If a fever lasts more than 3 days it is worth a review by your GP or polyclinic anyway, since roseola can only be confirmed once the rash appears.
Is roseola contagious? Can my child go to infant care?+
Yes, roseola spreads through saliva and droplets, and it is most contagious during the fever phase, before the rash gives the diagnosis away. Once the fever has settled and your child is well, they are generally past the infectious stage. Keep your child home while feverish, and check your infant care centre's rules on returning.
Is the roseola rash itchy or painful?+
Usually not. The rash does not normally bother the child, needs no cream or treatment, and fades on its own within a day or two. By the time it appears, most children are already back to their usual selves.
Can roseola cause a febrile seizure?+
It can. Roseola fevers tend to rise quickly, and a fast-rising fever is the common trigger for febrile seizures in young children. Most children with roseola will not have one, but it helps to know what to do in case, so read our febrile seizure guide once rather than during one.