How can I tell roseola from measles or other rashes?

The timing is the key clue. In roseola the rash appears only after the fever breaks, and the child usually feels better by then. In measles the rash appears while the child is still feverish and very unwell, with cough, red eyes, and a runny nose. If you are unsure, or if the rash does not fade when you press a glass against it, see a doctor.

Is roseola contagious once the rash appears?

The virus spreads mainly during the fever phase, before anyone knows it is roseola. By the time the rash appears, the child is generally considered no longer contagious and can return to nursery once the fever has been gone for 24 hours and they feel well.

My child had a seizure with the fever. Is that dangerous?

Febrile seizures are frightening to watch, but in otherwise healthy children they are almost always brief and cause no lasting harm. Roseola is a common trigger because the temperature rises so quickly. Any first seizure should be assessed by a doctor, and you should call emergency services if a seizure lasts longer than 5 minutes or the child does not recover normally afterwards.

PediatricICD-10: B08.20Very common; nearly all children have been infected by age 2, though many have no obvious symptoms

Roseola

Also known as: Roseola infantum, Sixth disease, Exanthem subitum

Roseola is a common, mild viral infection that mainly affects babies and toddlers between six months and two years of age. It is caused by human herpesvirus 6 (and sometimes 7) and follows a distinctive pattern: a sudden high fever lasting three to five days, after which the fever drops abruptly and a rash of small pink spots appears on the trunk, spreading to the neck, face, and limbs. The rash is not itchy and fades within a day or two. Because the fever can be high, roseola is one of the more common triggers of febrile seizures in young children, which is alarming but almost always harmless. Most children recover completely without treatment and are immune afterwards.

At a Glance

Common symptoms: A sudden high fever, often 39.5°C or above, lasting 3 to 5 days, A child who seems relatively well and active despite the fever, Mild runny nose, sore throat, cough, or swollen glands in the neck
Main treatments: No specific treatment is needed; roseola resolves on its own, Paracetamol or ibuprofen to make a feverish child more comfortable (following age-appropriate dosing), Plenty of fluids: breast milk, formula, water, or diluted juice depending on age
Category: Pediatric · Very common; nearly all children have been infected by age 2, though many have no obvious symptoms
See a doctor if: Fever above 39.5°C that does not come down with medication, or any fever in a baby under 3 months

Symptoms

A sudden high fever, often 39.5°C or above, lasting 3 to 5 days

A child who seems relatively well and active despite the fever

Mild runny nose, sore throat, cough, or swollen glands in the neck

A rash of small pink or red spots appearing as the fever ends, starting on the chest and back

Rash that spreads to the neck, face, arms, and legs and is not itchy

Irritability, mild diarrhoea, or reduced appetite

Swollen eyelids or puffiness around the eyes in some children

Causes

Infection with human herpesvirus 6 (HHV-6), and less often HHV-7
Spread through saliva and respiratory droplets, often from adults or older children who carry the virus without symptoms
Close contact and shared cups, toys, or cutlery
Waning of protective antibodies passed from the mother, which leaves babies susceptible after about 6 months

Risk Factors

Age 6 months to 2 years, when protection from maternal antibodies has waned
Attendance at nursery or daycare
Older siblings
Weakened immune system, where the virus can cause more serious illness

Diagnosis

Clinical diagnosis based on the typical sequence of high fever followed by a rash
Examination to rule out other causes of fever, such as ear or urinary infection, during the fever phase
Blood tests only in unusual or severe cases, or in children with weakened immunity

Treatment

No specific treatment is needed; roseola resolves on its own
Paracetamol or ibuprofen to make a feverish child more comfortable (following age-appropriate dosing)
Plenty of fluids: breast milk, formula, water, or diluted juice depending on age
Light clothing and a comfortably cool room; avoid cold baths or sponging
Antiviral medication only in rare cases for children with severely weakened immune systems
Supportive: rest, cuddles, and keeping the child home until the fever has gone

Prevention

Regular hand washing for everyone caring for the child
Avoid sharing cups, spoons, and dummies between children
Clean toys and surfaces regularly in nurseries
There is no vaccine; nearly all children are exposed by early childhood and become immune

When to See a Doctor

Fever above 39.5°C that does not come down with medication, or any fever in a baby under 3 months
A seizure (call emergency services if it lasts more than 5 minutes)
Fever lasting more than 5 days, or a rash that does not fade when pressed with a glass
Drowsiness, difficulty waking, a stiff neck, or refusal to drink
Your child has a weakened immune system and develops a high fever

Frequently Asked Questions

Related Conditions

Fifth Disease

Pediatric

Febrile Seizures

Pediatric

Measles

Infectious

Have questions about Roseola?

Ask Mother Nature AI for personalized, evidence-based guidance.

Ask about Roseola

Medical Disclaimer: This content is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider.

Content reviewed against peer-reviewed medical literature and clinical guidelines. Read our editorial standards.