Your child has had a high fever for three days. Suddenly the temperature drops, and a pink rash appears on the body. Is it dangerous? What is happening?

Roseola (roseola infantum, exanthema subitum) is one of the most common childhood illnesses. It is a mild viral infection that almost all children go through, usually without complications. The most characteristic feature is the sudden rash that appears precisely when the fever disappears.

What Is Roseola?

Roseola is caused by human herpesvirus 6 (HHV-6), and less commonly HHV-7. The virus belongs to the herpesvirus family, but has nothing to do with genital herpes or cold sores.

Key facts:

Most commonly affects children between 6 months and 2 years
Most common between 9 and 21 months
Most children have had the illness by the age of 3
After recovering from the infection, the child is immune — roseola is only experienced once
The illness is mild and very rarely causes complications

Roseola is also called the sixth disease because it was historically counted as the sixth of the classic childhood illnesses with a rash (after measles, scarlet fever, rubella, fourth disease, and fifth disease).

Symptoms and Course

Roseola has a very characteristic two-phase course:

Phase 1: Fever (Day 1–3, sometimes up to 5 days)

Sudden high fever — the temperature rises rapidly to 38.5–40.5°C (101–105°F)
The fever lasts 3–5 days — remaining consistently high
The child is often surprisingly unaffected — many children play and eat quite normally despite the high fever
Mild irritability — the child may be slightly more demanding than usual
Possibly swollen lymph nodes — particularly behind the ears and in the neck
Mild cold symptoms — some children have a slightly runny nose or mild cough

Phase 2: Rash (After the Fever Breaks)

The fever disappears suddenly — often within a few hours
A pink-red rash appears — usually the same day or the day after the fever is gone
The rash starts on the body (chest, abdomen, back) and may spread to the neck, face, and arms
Small, flat or slightly raised pink spots — 2–5 mm in diameter
The rash blanches when pressed (if you gently press on a spot, it temporarily disappears)
No itching — unlike many other rashes
The rash lasts 1–3 days and disappears without treatment

The characteristic feature of roseola is the sequence: first fever, then rash. With many other childhood illnesses (such as chickenpox or measles), the fever and rash appear at the same time. The rash with roseola means the child is on the way to recovery.

Incubation Period and Contagion

Incubation period: 5–15 days, usually 9–10 days
Contagious: Mainly during the fever period, before the rash appears
Transmission: Droplet transmission (coughing, sneezing) and contact transmission (saliva)

An important point: When the rash appears, the child is usually no longer contagious. Many parents only discover the illness when the rash appears — by which time the child has already been contagious during the days with fever.

Treatment

There is no specific treatment for roseola. The illness is self-limiting and requires only symptomatic measures:

Fever Management

Acetaminophen (Tylenol) — give the age-appropriate dose to reduce fever and relieve discomfort
Ibuprofen (Motrin, Advil) — can be used in children over 6 months as an alternative or supplement
Plenty of fluids — offer frequently, in small sips. Breast milk, formula, water, or diluted juice
Light clothing — don't overdress the child. Layer clothing so you can adjust as needed

General Comfort

Rest — let the child rest, but don't force them to stay in bed if they want to play
Normal diet — offer food as usual, but don't force it if appetite is poor
Cool room — ensure a comfortable temperature in the bedroom (65–68°F / 18–20°C)

Remember that the fever with roseola is the body's natural response to the viral infection. You don't necessarily need to treat the fever with medication if the child is doing well. Give fever-reducing medication if the child is clearly uncomfortable, sleeping poorly, or not drinking enough.

Treatment of the Rash

The rash with roseola requires no treatment. It does not itch and is not painful. It will disappear on its own within 1–3 days.

Can Roseola Cause Complications?

Roseola is a mild illness, and complications are rare. However, it is useful to know about:

Febrile Seizures

The most common complication is febrile seizures, which can occur with rapid temperature rise. Approximately 10–15 percent of children who get febrile seizures do so in connection with roseola.

If febrile seizures occur:

Place the child on their side
Do not hold the child down or put anything in their mouth
Note how long the seizure lasts
Call 911 if the seizure lasts more than 5 minutes
Contact a doctor after the seizure, even if it was brief

Read more about fever and febrile seizures in our article on fever in children.

Other Rare Complications

Encephalitis (brain inflammation) — very rare
Hepatitis (liver inflammation) — very rare
These complications are extremely uncommon in otherwise healthy children

When Should You Contact a Doctor?

Contact your pediatrician or urgent care if:

The child is under 3 months with a fever above 38°C (100.4°F)
The fever lasts more than 5 days
The child is drinking very little and showing signs of dehydration
The child is very lethargic or difficult to wake
You are unsure whether the rash is caused by roseola or something else
The child has a weakened immune system

Call 911 if:

The child has seizures
The child has severe breathing difficulties
The child is limp, pale, and difficult to rouse
The child has a rash that does not blanch when pressed (petechiae) — this is NOT typical of roseola and may indicate a more serious condition

Important about the rash: The rash with roseola blanches when you press on it. If the child has a rash that does NOT blanch when pressed (small, purple-red spots that remain visible), this may indicate a more serious illness such as meningococcal sepsis. Contact a doctor immediately.

Roseola vs. Other Childhood Illnesses

It can be difficult to distinguish roseola from other conditions. Here are some differences:

Illness	Fever	Rash	Difference
Roseola	First, 3–5 days	After fever breaks	Rash is a good sign
Chickenpox	Concurrent with rash	Blisters that itch	Itchy blisters at various stages
Measles	Concurrent with rash	From face downward	Cough, pink eye, sicker child
Fifth disease	Little/no fever	"Slapped cheek" rash	Intensely red cheeks
Scarlet fever	Concurrent	Sandpaper-like	Strawberry tongue, sore throat

Daycare and Contagion

Can the Child Go to Daycare?

During the fever period, the child should stay home (fever-free for at least 24 hours without fever-reducing medication)
When the rash has appeared, the child is usually no longer contagious and can return
The child should be in good general condition

Is Roseola Dangerous for Pregnant Women?

HHV-6 generally poses no risk to pregnant women. It is not comparable to, for example, rubella, CMV, or fifth disease (parvovirus B19), which can affect the fetus.

Frequently Asked Questions

Can you get roseola twice?

Very rarely. After recovering from an HHV-6 infection, the child develops lifelong immunity. In very rare cases, HHV-7 (a closely related virus) can cause a similar illness.

How old is the baby usually when they get roseola?

Most children get roseola between 6 and 24 months. Before 6 months, the baby is often protected by maternal antibodies. After 3–4 years, almost all children have been through the illness.

Does the child need antibiotics?

No, roseola is caused by a virus, and antibiotics only work against bacteria. Sometimes a doctor may start antibiotics because the cause of the fever is unknown — if it turns out to be roseola, antibiotics can be discontinued.

Should the child avoid bathing when they have the rash?

No, the rash does not itch and is not worsened by water. The child can bathe and shower normally.

Can roseola cause cold sores?

No. Although HHV-6 belongs to the herpesvirus family, it is a completely different virus from HSV-1, which causes cold sores.

Related Tools on Babysential

Health overview for your baby — log fever course and symptoms
Sleep tracker — monitor sleep during the illness period

Sources

CDC — Roseola — Centers for Disease Control and Prevention
AAP — Roseola Infantum — American Academy of Pediatrics
Mayo Clinic — Roseola — Mayo Clinic

This article is written for informational purposes and does not replace medical advice. Contact your pediatrician if you are unsure about your child's symptoms or diagnosis.

Roseola in Children (Three-Day Fever): Symptoms and Course