Fifth Disease, Roseola and Other Childhood Rashes: A Parent’s Identification Guide

The photo arrives in the parents’ group chat at 9:40 p.m.: a toddler’s back, flash-lit, dotted with pale pink spots. “Fever broke this afternoon, then this. Roseola? Measles? Do we go in?” Within minutes there are eleven replies and four different diagnoses. A decade ago that message would have drawn a shrug. Today it lands differently, because the rash landscape has genuinely shifted.

As of autumn 2025, two developments explain why roseola, fifth disease and childhood rashes in general are climbing the search charts. In August 2024 the CDC issued a formal health alert about an unusual rise in parvovirus B19, the virus behind fifth disease, with the steepest increase among 5- to 9-year-olds. Then 2025 brought the largest annual measles count the United States has recorded in more than three decades. Suddenly a spotty, feverish child is no longer automatically “just a virus” in a parent’s mind.

The good news is that most childhood rashes still follow recognizable scripts. Learn the scripts, and that late-night photo becomes far less frightening.

What changed recently with roseola, fifth disease and other kids rashes

The viruses behind these rashes have not changed. What changed is how often they are circulating and how closely they are being tracked. On August 13, 2024, the CDC issued a Health Alert Network advisory after laboratories reported an unusual rise in parvovirus B19, the virus that causes fifth disease. The share of tested blood samples showing a recent infection climbed from under 3 percent in the previous two years to about 10 percent in June 2024, and among children aged 5 to 9 it reached roughly 40 percent. The alert also flagged more complications in pregnant people and in people with sickle cell disease, the two groups for whom this ordinarily mild virus matters most.

Measles added a second layer. By mid-2025, the CDC’s national count had passed every annual total since 1992, driven by outbreaks in under-vaccinated communities. Measles is rare enough that many parents, and plenty of younger clinicians, have never seen its rash in person, so a feverish child with spots now prompts a question that would have seemed far-fetched ten years ago.

Roseola sits quietly in the middle of all this. Nothing about the virus is new, and no advisory has been issued about it. It is simply the most common cause of fever-then-rash in children under two, which makes it the illness most often mistaken for something more worrying and the one most often searched when a toddler’s temperature spikes for no obvious reason. The facts in this guide draw on CDC, NHS, Mayo Clinic and MedlinePlus pages current as of autumn 2025. If a newer advisory appears, your child’s clinician will have it before any magazine does.

What is roseola, and how does a child get it?

Roseola is caused mostly by human herpesvirus 6, usually written HHV-6, and sometimes by its close cousin HHV-7. Despite the family name, these viruses have nothing to do with cold sores or genital herpes; “herpesvirus” is simply the biological family they belong to, like saying a fox and a dog are both canines. Doctors also call the illness roseola infantum, exanthem subitum (Latin for “sudden rash”) and sixth disease, a leftover from an early-1900s numbering system for childhood rashes in which measles was first and fifth disease, naturally, was fifth.

Children catch it the ordinary way: from the saliva and respiratory droplets of someone who already carries the virus, which, in practice, means almost every adult and older child around them. HHV-6 settles into the body for life after the first infection and is shed in saliva at low levels for years, so a toddler sharing a spoon with a parent or a cup with a sibling is exposed constantly. That is why there is no “roseola season” and no obvious outbreak pattern; infection trickles through the population year-round.

The illness peaks between 6 months and 2 years of age, a window that opens when antibodies passed from the mother in late pregnancy fade and closes once the child has met the virus. Serologic surveys, which test blood for antibodies, show that the large majority of children have been infected by age 2 and nearly all by age 3. Many of those infections are so mild they are never labeled roseola at all; the child simply has an unexplained fever one week and is fine the next. The incubation period, meaning the gap between exposure and symptoms, runs roughly one to two weeks, which is why parents can rarely pinpoint where it came from.

Roseola symptoms day by day: fever first, rash second

Roseola tells its story in two acts, and the order is the whole point.

Act one is fever, and it is often dramatic. Temperatures of 103°F (39.4°C) or higher are common and may last three to five days. What unsettles parents is the mismatch: the thermometer says “very sick” while the child says otherwise, still reaching for toys between naps, perhaps a little clingy or irritable, perhaps with a mild runny nose, slightly puffy eyelids or small swollen lymph nodes at the back of the neck. Some children develop tiny red spots on the soft palate, the fleshy back part of the roof of the mouth. Appetite dips. Nothing else explains the fever, and a clinician examining the child during this phase often finds no focus of infection, which is exactly the frustrating picture roseola creates.

Act two begins the moment the fever drops, sometimes within hours. Pink or rose-colored spots, each about 2 to 5 millimeters across and some ringed by a paler halo, appear first on the chest, back and abdomen. From there they may spread to the neck, face, arms and legs, though the limbs are often spared. Press a spot gently with a fingertip or a clear glass and it blanches, meaning it fades to skin color under pressure. The rash does not itch, does not blister and does not peel. It can last anywhere from a few hours to two days and then simply vanishes.

The single most useful detail to report to a clinician is that sequence: high fever, then a sudden break, then the rash. Reverse the order and roseola becomes much less likely.

How long does roseola usually last, and is it contagious to adults?

Count from the first fever and most children are through the whole thing in five to seven days. The fever portion typically occupies three to five of those days, and the rash rarely outstays two. Fatigue and a cautious appetite may trail along for a day or so afterward, but there is no lingering cough, no peeling skin and no second wave.

Contagiousness follows a pattern that surprises many parents: the child is most infectious during the fever, before anyone knows what the illness is, and the rash itself signals that the body is already winning. Public health guidance on childcare attendance reflects this. Most programs ask that a child be fever-free for 24 hours without fever-reducing medicine, and once that bar is met the rash alone is not a reason to stay home. Check your own center’s policy, because some apply stricter rules to any visible rash.

Can adults catch roseola from a child? In principle yes, in practice almost never. Because HHV-6 infects nearly everyone in early childhood and then remains in the body, the overwhelming majority of adults already carry it and have lifelong immunity to a new infection. The rare adult who was somehow never exposed could develop a fever and rash, and a small number of case reports describe a mononucleosis-like illness. The group for whom HHV-6 genuinely matters is adults with severely weakened immunity, such as recipients of bone marrow or organ transplants, in whom the dormant virus can reactivate. That is a different clinical situation managed by specialists, and it is not something a healthy parent needs to fear from a toddler’s rash.

One infection usually confers lasting protection, though a second, milder episode can occasionally occur if the first was HHV-6 and the second is HHV-7.

Fifth disease: the slapped cheek rash that arrives after the child feels better

If roseola is a toddler’s illness, fifth disease belongs to the elementary school. Parvovirus B19, its cause, spreads through respiratory droplets and favors children aged roughly 5 to 15, which is why it often sweeps through a classroom in late winter and spring. The incubation period runs from about four days to two weeks, and the first phase is thoroughly unremarkable: a low fever, a runny nose, a headache, maybe an upset stomach. Many children never register as ill.

Then, a few days after those symptoms fade, the cheeks flush bright red as if freshly slapped, with a telltale pale ring around the mouth. The NHS calls the illness slapped cheek syndrome for exactly this reason. One to four days later a second rash appears on the arms, trunk and thighs: pink, slightly raised and arranged in a distinctive lacy or net-like pattern, as though someone had pressed a doily against the skin. It can itch, particularly on the soles of the feet, and it usually fades within a week to ten days.

Here is the twist that catches families out. The fifth disease rash may reappear for weeks afterward whenever the child is warm: after a bath, a run around the playground or an afternoon in the sun. This flaring is not a new infection and does not mean the child is contagious again. It is the skin’s blood vessels dilating and briefly highlighting an old pattern, and it fades on its own.

Contagiousness is the mirror image of what instinct suggests. A child with fifth disease sheds virus during the cold-like phase and is generally no longer infectious once the rash shows up. By the time the diagnosis is obvious, the window for spreading it has usually closed, which is why schools do not typically exclude children for the rash itself.

Who needs extra care with fifth disease: pregnancy, sickle cell disease and weakened immunity

For most children, fifth disease is a footnote. The 2024 CDC alert existed because of the people for whom it is not.

Parvovirus B19 reproduces inside the young red blood cells of the bone marrow, briefly pausing their production. A healthy child has such a deep reserve of red cells that a few days’ pause goes unnoticed. A child or adult with sickle cell disease, thalassemia or another condition in which red cells already live a shortened life has no such cushion, and the pause can trigger a sudden, severe drop in red cells that doctors call an aplastic crisis. Sudden pallor, racing heartbeat, breathlessness or extreme tiredness in such a child after a classroom exposure is a same-day medical matter.

Pregnancy is the second concern. If a pregnant person who has never had parvovirus B19 catches it, the virus can cross the placenta and slow the fetus’s red cell production, leading to fetal anemia and, in the most serious cases, a dangerous fluid buildup called hydrops fetalis. The reassuring context: about half of adults are already immune, most infected pregnancies end with a healthy baby, and the risk of fetal loss, concentrated in the first half of pregnancy, is well under one in twenty among those infected. Anyone pregnant who learns of an exposure, for example because their child or a classroom contact develops slapped cheeks, should tell their obstetric clinician. A blood test can show whether immunity already exists, and if a new infection is confirmed, ultrasound monitoring can watch for fetal anemia, which specialists can treat if needed.

People with weakened immune systems from cancer treatment, transplants or advanced HIV may struggle to clear the virus and can develop a persistent anemia. Adults in general, even healthy ones, are more likely than children to experience aching, swollen joints that can linger for weeks before settling.

Kids rashes side by side: a parent's comparison table

No table replaces an examination, and plenty of children present with features from two columns at once. But when a parent can say “the fever ended before the rash began” or “it started at the hairline,” the diagnostic conversation moves much faster. These six illnesses account for a large share of fever-plus-rash visits in childhood.

Illness	Typical age	Fever pattern	Where rash starts and how it looks	Most contagious	Vaccine
Roseola (HHV-6/7)	6 months to 2 years	High for 3–5 days, then breaks	Trunk; pink spots, non-itchy, appears as fever ends	During fever, before rash	None
Fifth disease (parvovirus B19)	5 to 15 years	Low or none, early	Cheeks, then lacy rash on arms and trunk	Before rash appears	None
Measles	Any unvaccinated age	High and continuing as rash spreads	Hairline and face, moving down; red, blotchy, merging	4 days before to 4 days after rash	MMR
Chickenpox (varicella)	Any unvaccinated age	Mild to moderate	Trunk and scalp; itchy blisters in different stages	1–2 days before rash until all lesions crust	Varicella
Hand, foot and mouth disease	Under 5 years	Mild	Mouth sores; blisters on palms, soles, buttocks	First week, stool shedding longer	None in the US
Scarlet fever (group A strep)	5 to 15 years	With sore throat	Neck and chest; fine sandpaper texture, strawberry tongue	Until about 12–24 hours on antibiotics	None

Two columns deserve a second look. Measles is the only illness here in which the fever stays high while the rash spreads; everything else either has little fever or has already shed it. Scarlet fever is the only one where antibiotics change the course, because it is bacterial. If you remember nothing else from this table, remember those two exceptions.

Roseola vs measles: why the order of symptoms matters more than the spots

In a year when measles is back in the headlines, this is the comparison parents most want settled, and it turns out that timing does most of the work.

Measles opens with two to four days of escalating fever accompanied by what clinicians call the three Cs: cough, coryza (a heavy runny nose) and conjunctivitis (red, watery, light-sensitive eyes). The child looks and feels genuinely ill. Around day two or three, tiny white specks on a red base, known as Koplik spots, may appear on the inside of the cheeks opposite the molars. Only then does the rash begin, and it begins at the hairline and behind the ears, red and blotchy, flowing downward over the face, trunk and finally the limbs over about three days while the fever climbs even higher. The rash persists five to six days, darkens to a brownish shade and may peel as it fades.

Roseola runs that script backward. The fever comes first and ends abruptly; the rash appears after it is gone, starts on the trunk rather than the face, stays pink rather than deep red, and is gone within two days. The child during the roseola rash is typically cheerful. The child during the measles rash is typically miserable.

Vaccination history is the other decisive clue. A child who has received two doses of MMR vaccine has roughly 97 percent protection against measles, so a trunk-first rash in a fully vaccinated toddler after a fever breaks is overwhelmingly likely to be roseola or another benign virus. If measles is genuinely on the table, because of travel, a known exposure or an unvaccinated child with the three Cs, call the clinic before arriving so staff can prevent exposure to others in the waiting room. Measles is among the most contagious infections known, and that phone call protects infants too young for the vaccine.

Hand, foot and mouth disease, chickenpox and scarlet fever: three common look-alikes

Three more illnesses regularly share the examination table with roseola and fifth disease, and each carries a feature that gives it away.

Hand, foot and mouth disease is caused by enteroviruses, most often coxsackievirus, and clusters in children under five, especially in summer and early fall. The name is the description: painful sores inside the mouth that can make a toddler refuse to drink, plus small blisters or red spots on the palms, soles and often the buttocks. Fever is mild and short. The main risk is dehydration from a sore mouth, so a child who stops producing wet diapers deserves a call. It resolves in seven to ten days, and fingernails or toenails occasionally shed weeks later, which looks alarming but is harmless.

Chickenpox has become uncommon in vaccinated populations but has not disappeared. Its rash is the itchiest of the group and the only one that blisters widely: small red bumps become fluid-filled vesicles, then crust over, with new crops appearing for several days so that spots at every stage coexist on the same patch of skin. It usually begins on the trunk, face and scalp, and the scalp involvement is a strong clue, since roseola and fifth disease generally leave it alone.

Scarlet fever is the outlier because it is bacterial. Group A streptococcus, the same bacterium behind strep throat, releases a toxin that produces a fine red rash with the texture of sandpaper, beginning on the neck and chest and concentrating in skin folds. The tongue may look white-coated and then bright red and bumpy, the “strawberry tongue.” The cheeks flush but the area around the mouth stays pale, which can mimic fifth disease, except that scarlet fever comes with a genuinely sore throat and fever. A throat swab settles it, and a course of antibiotics prescribed by the clinician shortens the illness and prevents complications.

Is roseola the same as RSV? Sorting out the viruses that share a season

Roseola and RSV are two entirely different viruses with two entirely different jobs, and the confusion is understandable only because both strike babies. RSV, short for respiratory syncytial virus, infects the airways. It causes a runny nose, cough, wheezing and, in infants, bronchiolitis, an inflammation of the smallest air passages in the lungs that can make breathing fast and labored. It peaks in fall and winter, spreads through families like a cold, and produces no rash at all. A baby with RSV is a baby you worry about in terms of breathing and feeding.

Roseola, by contrast, barely touches the lungs. Its hallmarks are fever and skin, it circulates year-round, and a child with roseola usually breathes normally. The two can occur in the same winter, even in the same child a few weeks apart, but one does not cause or turn into the other. If a clinician diagnoses roseola and the child later develops wheezing and a hard cough, that is a new question, not a progression.

Prevention also differs. There is no vaccine for roseola and none in development that is anywhere near use. RSV prevention, on the other hand, has changed markedly: the CDC now recommends either a vaccine given during pregnancy or a long-acting antibody product given to infants in their first RSV season, depending on circumstances and the clinician’s judgment. The details of eligibility belong in a conversation with the pediatric or obstetric clinician.

Parents sometimes ask the related question of whether roseola is a type of measles, since older relatives may call it “baby measles.” It is not. The nickname survives from an era before the virus was identified in 1988; the two illnesses share a family of symptoms, not a cause, and the MMR vaccine has no effect on roseola.

What the evidence actually says about roseola and fifth disease

Not all of the facts in this guide stand on equally firm ground, and parents deserve to know which is which.

The identity of the viruses is settled science. HHV-6 was isolated from roseola patients in the late 1980s and confirmed as the cause by virologic studies that detected the virus in blood during the fever and demonstrated the rise of specific antibodies afterward. Parvovirus B19 was linked to fifth disease the same way in the early 1980s. These are laboratory findings replicated worldwide, the strongest type of evidence for cause.

The natural history, meaning the typical ages, fever duration and rash timing, comes from observational studies: hospital series, community cohorts followed from birth and seroprevalence surveys. Observational data are reliable for describing what usually happens but less precise at the edges. That is why figures such as “febrile seizures in roughly 10 to 15 percent of roseola cases” or “about half of adults immune to parvovirus” vary between sources. The direction is consistent; the exact decimal is not.

Pregnancy outcomes in fifth disease rest on prospective cohorts in which infected pregnant women were followed to delivery. These studies agree that most pregnancies are unaffected and that fetal loss risk is highest before 20 weeks, but they involve hundreds rather than tens of thousands of participants, so confidence intervals are wide.

Treatment evidence tells a plainer story. No randomized trial supports antiviral treatment for roseola or fifth disease in otherwise healthy children, and no major guideline recommends it. Care is supportive and rests on expert consensus. One genuinely trial-tested finding is relevant: randomized studies show that giving fever reducers does not prevent febrile seizures from recurring, so these medicines are for comfort, not for seizure prevention.

Vaccine effectiveness for measles and chickenpox, finally, sits at the top of the evidence hierarchy, supported by randomized trials and decades of population surveillance.

Common myths about roseola, fifth disease and kids rashes

Group chats are efficient at spreading reassurance and misinformation in equal measure. These are the claims that circulate most, with the record set straight.

“The rash means the child is still contagious.” For roseola and fifth disease the opposite is closer to the truth. Both are spread mainly before the rash, during the fever or cold-like phase. By the time spots appear, infectiousness has largely passed. Chickenpox and measles are the exceptions, and they remain contagious during the rash.

“Teething caused the fever and the rash.” Teething can make a baby drool, fuss and run a very slight temperature rise. Mayo Clinic and other sources are clear that it does not cause high fever, and it does not cause a body rash. A toddler with 103°F and spots has an infection, and roseola is the most likely one.

“Roseola is a mild form of measles.” Different virus, different illness, different timing. The MMR vaccine neither prevents roseola nor is affected by it.

“The fifth disease rash came back, so the infection is back.” Heat, sun and exercise can make the faded lacy rash reappear for weeks. This is a vascular echo, not a reinfection, and the child is not contagious.

“Antibiotics will clear the rash faster.” Antibiotics act on bacteria. Of the illnesses in this guide only scarlet fever is bacterial; for the viral rashes, antibiotics offer nothing except side effects and resistance.

“A high fever that climbs fast will damage the brain.” Fever from a common infection, even above 104°F, does not cause brain damage. Febrile seizures, frightening as they are, are also not associated with lasting harm in otherwise healthy children. What matters is how the child looks and behaves, not the number alone.

How to care for a child with roseola or fifth disease at home, and which vaccines help

Supportive care is the entire treatment for roseola and fifth disease, and it is less passive than it sounds. The aim is comfort and hydration while the immune system does the actual work.

Fluids come first. A feverish toddler loses more water through skin and breath, so offer breast milk, formula, water or diluted juice often and in small amounts. Count wet diapers; fewer than usual is an early sign of dehydration. Dress the child lightly, keep the room comfortable rather than cold, and skip the sponge baths with cool water, which make children shiver and cry without lowering temperature meaningfully. A fever reducer appropriate for the child’s age, chosen and dosed according to the clinician’s advice and the product label, can ease discomfort. Aspirin is never given to children with viral illnesses because of the risk of Reye’s syndrome, a rare but serious swelling of the liver and brain. Remember that the goal of a fever reducer is a more comfortable child, not a normal thermometer, and that these medicines have not been shown to prevent febrile seizures.

For fifth disease, cool compresses or a clinician-recommended anti-itch measure can help if the lacy rash itches. Rest matters less than many expect; a child who feels well enough to play should be allowed to.

Vaccines reshape the rash landscape where they exist. Per CDC schedules, children receive the first MMR dose at 12 through 15 months and the second at 4 through 6 years, and the varicella vaccine follows the same two-dose timing. Two MMR doses protect roughly 97 percent of recipients against measles, which is why a vaccinated toddler’s rash is so rarely measles. No vaccine exists for roseola, fifth disease, hand, foot and mouth disease or scarlet fever, so for those illnesses handwashing, covering coughs and not sharing cups remain the only prevention. Questions about catch-up doses or special circumstances belong with the child’s clinician.

When to see a doctor about roseola or any childhood rash

Most children with roseola or fifth disease never need to be seen, and a phone or portal message to the pediatric clinic is often enough to confirm the pattern. The situations below are different. They call for same-day contact, and the ones marked urgent call for emergency care.

• Urgent: a rash of purple or dark red spots that do not fade when pressed with a clear glass, especially with fever, cold hands and feet, drowsiness or a stiff neck. A non-blanching rash can signal meningococcal infection or another bloodstream infection.
• Urgent: a seizure of any kind. A first febrile seizure, even if it ends quickly, requires medical evaluation, and a seizure lasting more than five minutes or followed by difficulty waking needs emergency services.
• Urgent: labored or very rapid breathing, blue or gray lips, or a child who cannot be roused or consoled.
• Any fever in a baby under 3 months, regardless of rash.
• Fever lasting more than five days, or returning after the rash has appeared.
• Fever with red eyes, cracked red lips, a swollen tongue, swollen hands or feet or peeling fingertips, a combination that raises the possibility of Kawasaki disease, an inflammatory condition needing prompt treatment.
• Signs of dehydration: no wet diaper in eight hours, no tears, a sunken soft spot or dry mouth.
• A rash with fever in a child who is unvaccinated, has recently traveled or has had a known measles exposure. Call before visiting so the clinic can arrange infection control.
• Possible fifth disease exposure in anyone who is pregnant, has sickle cell disease or thalassemia, or has a weakened immune system.
• A rash that blisters widely, spreads rapidly, or involves the mouth and eyes.

Every decision about testing, treatment and school or childcare return rests with the clinician who examines the child. This guide helps you describe what you are seeing; it cannot see the child.

Frequently asked questions

How does a child get roseola?

A child catches roseola from the saliva or respiratory droplets of someone who carries human herpesvirus 6 or 7, which includes nearly every adult and older child. The virus stays in the body for life after first infection and is shed at low levels for years, so toddlers are exposed constantly through shared cups, spoons and close contact. Symptoms appear roughly one to two weeks after exposure.

Is roseola contagious to adults?

Rarely in any practical sense. Almost all adults were infected with HHV-6 in early childhood and carry lifelong immunity, so a healthy parent is very unlikely to catch roseola from a child. The exception is adults with severely weakened immune systems, such as transplant recipients, in whom the dormant virus can reactivate; that situation is managed by their specialist, not prompted by a toddler’s rash.

How long does roseola usually last?

Most children are through roseola in five to seven days. The fever phase typically lasts three to five days, and the rash that follows fades within a few hours to two days without peeling or scarring. A mildly reduced appetite may linger a day longer. If fever persists beyond five days or returns after the rash, the child should be reassessed by a clinician.

Is roseola the same as RSV?

No. Roseola is a fever-and-rash illness caused by HHV-6 or HHV-7 and does not affect breathing. RSV, respiratory syncytial virus, infects the airways and causes cough, wheezing and, in infants, bronchiolitis, with no rash. Both are common in babies and can occur in the same winter, but neither causes or turns into the other, and RSV has preventive options while roseola has none.

How can I tell fifth disease from roseola?

Age and timing do most of the work. Roseola strikes children between 6 months and 2 years with several days of high fever followed by a pink trunk rash once the fever breaks. Fifth disease affects school-age children, begins with mild cold symptoms and little fever, then produces bright red cheeks followed by a lacy rash on the arms and trunk that may flare with heat for weeks.

Can a child get roseola twice?

It is uncommon but possible. One infection with HHV-6 usually provides lasting protection against that virus, but a second, generally milder episode can occur if the first illness was caused by HHV-6 and the later one by its cousin HHV-7. Many apparent repeat cases are actually a different virus producing a similar fever-then-rash pattern, which a clinician can help sort out.

Should my child stay home from daycare with roseola or fifth disease?

Most programs require a child to be fever-free for 24 hours without fever-reducing medicine; once that is met, the roseola rash alone is not a reason to stay home. A child with fifth disease is generally no longer contagious once the slapped-cheek rash appears and can usually attend if feeling well. Policies vary, so confirm with your center and the child’s clinician.

Is fifth disease dangerous in pregnancy?

Usually not, but it deserves attention. About half of adults are already immune. If a non-immune pregnant person is infected, the virus can slow the fetus’s red blood cell production, and in a small minority of cases, mainly before 20 weeks, this leads to fetal anemia or loss. Anyone pregnant with a known exposure should tell their obstetric clinician, who can check immunity and arrange monitoring.

Why does the fifth disease rash keep coming back?

Warmth, sunlight, exercise and hot baths widen the skin’s blood vessels and briefly highlight the faded lacy pattern, sometimes for several weeks after the illness. This recurrence is not a new infection and the child is not contagious during it. The flares settle on their own; if a rash is itchy, painful or accompanied by new fever, a clinician should take a look.

Which kids rashes need emergency care?

Any rash of purple or dark red spots that does not fade when pressed with a clear glass, especially with fever, drowsiness or a stiff neck, needs emergency evaluation. So does a first seizure, any seizure longer than five minutes, labored breathing, blue lips, or a child who cannot be woken. Fever in a baby under 3 months is also urgent regardless of the rash.

References

• MedlinePlus: Roseola
• CDC: About parvovirus B19 (fifth disease)
• NHS: Slapped cheek syndrome
• CDC: Measles cases and outbreaks

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.